diff --git a/.node-version b/.node-version
new file mode 100644
index 0000000..dba04c1
--- /dev/null
+++ b/.node-version
@@ -0,0 +1 @@
+8.11.3
diff --git a/package-lock.json b/package-lock.json
index 1f874a4..80b88df 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,12 +10,14 @@
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@@ -53,14 +55,17 @@
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-      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y="
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@@ -73,14 +78,14 @@
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-      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8="
+      "version": "0.7.0",
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+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
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-      "optional": true,
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@@ -147,7 +143,7 @@
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-      "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
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@@ -283,15 +254,25 @@
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-      "integrity": "sha1-p1Xqe8Gt/MWjHOfnYtuq3F5jZEQ="
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+      "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk="
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-      "integrity": "sha1-M8GDrPGTJ27KqYFDpp6Uv+4XUNE=",
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-      "integrity": "sha1-M0gdDxu/9gDdID11gSpqX7oALio=",
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+        "qs": "~6.5.2",
+        "safe-buffer": "^5.1.2",
+        "tough-cookie": "~2.4.3",
         "tunnel-agent": "^0.6.0",
-        "uuid": "^3.0.0"
+        "uuid": "^3.3.2"
       }
     },
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@@ -1159,9 +1009,9 @@
       }
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-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
-      "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA=="
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.6.0.tgz",
+      "integrity": "sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg=="
     },
     "set-blocking": {
       "version": "2.0.0",
@@ -1173,35 +1023,27 @@
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
       "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
     },
-    "sntp": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/sntp/-/sntp-1.0.9.tgz",
-      "integrity": "sha1-ZUEYTMkK7qbG57NeJlkIJEPGYZg=",
-      "requires": {
-        "hoek": "2.x.x"
-      }
-    },
     "source-map": {
       "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
+      "resolved": "http://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
       "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
       "requires": {
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       }
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     "spdx-correct": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.0.0.tgz",
-      "integrity": "sha512-N19o9z5cEyc8yQQPukRCZ9EUmb4HUpnrmaL/fxS2pBo2jbfcFRVuFZ/oFC+vZz0MNNk0h80iMn5/S6qGZOL5+g==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
+      "integrity": "sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==",
       "requires": {
         "spdx-expression-parse": "^3.0.0",
         "spdx-license-ids": "^3.0.0"
       }
     },
     "spdx-exceptions": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.1.0.tgz",
-      "integrity": "sha512-4K1NsmrlCU1JJgUrtgEeTVyfx8VaYea9J9LvARxhbHtVtohPs/gFGG5yy49beySjlIMhhXZ4QqujIZEfS4l6Cg=="
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
+      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA=="
     },
     "spdx-expression-parse": {
       "version": "3.0.0",
@@ -1213,14 +1055,14 @@
       }
     },
     "spdx-license-ids": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.0.tgz",
-      "integrity": "sha512-2+EPwgbnmOIl8HjGBXXMd9NAu02vLjOO1nWw4kmeRDFyHn+M/ETfHxQUK0oXg8ctgVnl9t3rosNVsZ1jG61nDA=="
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.2.tgz",
+      "integrity": "sha512-qky9CVt0lVIECkEsYbNILVnPvycuEBkXoMFLRWsREkomQLevYhtRKC+R91a5TOAQ3bCMjikRwhyaRqj1VYatYg=="
     },
     "sshpk": {
-      "version": "1.14.2",
-      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.14.2.tgz",
-      "integrity": "sha1-xvxhZIo9nE52T9P8306hBeSSupg=",
+      "version": "1.15.2",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.15.2.tgz",
+      "integrity": "sha512-Ra/OXQtuh0/enyl4ETZAfTaeksa6BXks5ZcjpSUNrjBr0DvrJKX+1fsKDPpT9TBXgHAFsa4510aNVgI8g/+SzA==",
       "requires": {
         "asn1": "~0.2.3",
         "assert-plus": "^1.0.0",
@@ -1231,26 +1073,19 @@
         "jsbn": "~0.1.0",
         "safer-buffer": "^2.0.2",
         "tweetnacl": "~0.14.0"
-      },
-      "dependencies": {
-        "assert-plus": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
-        }
       }
     },
     "stdout-stream": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/stdout-stream/-/stdout-stream-1.4.0.tgz",
-      "integrity": "sha1-osfIWH5U2UJ+qe2zrD8s1SLfN4s=",
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/stdout-stream/-/stdout-stream-1.4.1.tgz",
+      "integrity": "sha512-j4emi03KXqJWcIeF8eIXkjMFN1Cmb8gUlDYGeBALLPo5qdyTfA9bOtl8m33lRoC+vFMkP3gl0WsDr6+gzxbbTA==",
       "requires": {
         "readable-stream": "^2.0.1"
       }
     },
     "string-width": {
       "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+      "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
       "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
       "requires": {
         "code-point-at": "^1.0.0",
@@ -1260,20 +1095,15 @@
     },
     "string_decoder": {
       "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
       "requires": {
         "safe-buffer": "~5.1.0"
       }
     },
-    "stringstream": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.6.tgz",
-      "integrity": "sha512-87GEBAkegbBcweToUrdzf3eLhWNg06FJTebl4BVJz/JgWy8CvEr9dRtX5qWphiynMSQlxxi+QqN0z5T32SLlhA=="
-    },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "requires": {
         "ansi-regex": "^2.0.0"
@@ -1302,7 +1132,7 @@
     },
     "tar": {
       "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
+      "resolved": "http://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
       "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=",
       "requires": {
         "block-stream": "*",
@@ -1311,11 +1141,19 @@
       }
     },
     "tough-cookie": {
-      "version": "2.3.4",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
-      "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
       "requires": {
+        "psl": "^1.1.24",
         "punycode": "^1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
+        }
       }
     },
     "trim-newlines": {
@@ -1324,25 +1162,11 @@
       "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM="
     },
     "true-case-path": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/true-case-path/-/true-case-path-1.0.2.tgz",
-      "integrity": "sha1-fskRMJJHZsf1c74wIMNPj9/QDWI=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/true-case-path/-/true-case-path-1.0.3.tgz",
+      "integrity": "sha512-m6s2OdQe5wgpFMC+pAJ+q9djG82O2jcHPOI6RNg1yy9rCYR+WD6Nbpl32fDpfC56nirdRy+opFa/Vk7HYhqaew==",
       "requires": {
-        "glob": "^6.0.4"
-      },
-      "dependencies": {
-        "glob": {
-          "version": "6.0.4",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-6.0.4.tgz",
-          "integrity": "sha1-DwiGD2oVUSey+t1PnOJLGqtuTSI=",
-          "requires": {
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "2 || 3",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
-          }
-        }
+        "glob": "^7.1.2"
       }
     },
     "tunnel-agent": {
@@ -1356,8 +1180,7 @@
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "optional": true
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
     },
     "uglify-es": {
       "version": "3.3.10",
@@ -1380,20 +1203,28 @@
         }
       }
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "uuid": {
-      "version": "3.2.1",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
-      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA=="
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
     },
     "validate-npm-package-license": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
-      "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
       "requires": {
         "spdx-correct": "^3.0.0",
         "spdx-expression-parse": "^3.0.0"
@@ -1407,13 +1238,6 @@
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
         "extsprintf": "^1.2.0"
-      },
-      "dependencies": {
-        "assert-plus": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
-        }
       }
     },
     "which": {
@@ -1439,7 +1263,7 @@
     },
     "wrap-ansi": {
       "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "requires": {
         "string-width": "^1.0.1",
@@ -1451,11 +1275,6 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
-    "xtend": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
-    },
     "y18n": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
diff --git a/package.json b/package.json
index a28f370..87a0bbc 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "watch-docs": "pipenv run sphinx-autobuild -c docs docs docs/_build/html"
   },
   "dependencies": {
-    "node-sass": "^4.9.0",
+    "node-sass": "^4.11.0",
     "uglify-es": "^3.3.10"
   }
 }