Bump http-server from 0.11.1 to 0.12.0 (#400)

Bump http-server from 0.11.1 to 0.12.0

package.json

@@ -78,7 +78,7 @@
     "eslint-plugin-import": "2.18.2",
     "eslint-plugin-unicorn": "13.0.0",
     "glob": "^7.1.6",
-    "http-server": "0.11.1",
+    "http-server": "0.12.0",
     "icon-font-generator": "2.1.10",
     "node-sass": "4.13.0",
     "node-sass-package-importer": "5.3.2",