Update http-server to avoid security problem

Author: RyanCavanaugh

package-lock.json

@@ -29,7 +29,7 @@
     "del": "^2.2.1",
     "gulp": "^3.9.1",
     "gulp-typescript": "^2.13.6",
-    "http-server": "^0.9.0",
+    "http-server": "^0.11.1",
     "merge-stream": "^1.0.0",
     "run-sequence": "^1.2.2",
     "ts-node": "^0.9.3",