chore(package): update http-server to version 0.12.3

Closes #48

Author: greenkeeper[bot]

demo/package.json

@@ -70,7 +70,7 @@
     "@types/node": "^10.14.4",
     "codelyzer": "^4.5.0",
     "express": "^4.16.4",
-    "http-server": "^0.11.1",
+    "http-server": "^0.12.3",
     "jest": "^24.5.0",
     "jest-preset-angular": "^6.0.2",
     "protractor": "^5.4.1",