Upgrade webpack dependency

Author: SpaceK33z

package.json

@@ -4,7 +4,7 @@
   "author": "Tobias Koppers @sokra",
   "description": "Serves a webpack app. Updates the browser on changes.",
   "peerDependencies": {
-    "webpack": "^2.1.0-beta.26 || ^2.2.0-rc.0"
+    "webpack": "^2.2.0"
   },
   "dependencies": {
     "chokidar": "^1.6.0",
@@ -40,7 +40,7 @@
     "style-loader": "~0.13.0",
     "supertest": "^2.0.0",
     "url-loader": "~0.5.6",
-    "webpack": "^2.2.0-rc.3"
+    "webpack": "^2.2.0"
   },
   "license": "MIT",
   "repository": {