Update packages to avoid security vulnerabilities. (#14)

Author: sblaurock

package-lock.json

@@ -28,7 +28,7 @@
     "eslint": "^6.4.0",
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-plugin-import": "^2.18.2",
-    "http-server": "^0.11.1",
+    "http-server": "^0.12.3",
     "jsdom": "^15.1.1",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",