feat(package): upgrade assets-webpack-plugin to 3.9.6

Author: joshuawilson

package.json

@@ -111,7 +111,7 @@
     "angular2-load-children-loader": "0.2.1",
     "angular2-router-loader": "0.3.5",
     "angular2-template-loader": "0.6.2",
-    "assets-webpack-plugin": "3.9.0",
+    "assets-webpack-plugin": "3.9.6",
     "autoprefixer": "9.1.0",
     "child_process": "1.0.2",
     "clean-css": "4.2.0",