chore(package): update clean-webpack-plugin to version 0.1.9 (#169)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -54,7 +54,7 @@
     "angular2": "2.0.0-beta.15",
     "awesome-typescript-loader": "^0.17.0-rc.6",
     "bootstrap": "3.3.6",
-    "clean-webpack-plugin": "0.1.8",
+    "clean-webpack-plugin": "0.1.9",
     "codecov": "1.0.1",
     "codelyzer": "0.0.15",
     "compression-webpack-plugin": "0.3.1",