webpack should be a devDependency

Author: sokra

package.json

@@ -18,7 +18,6 @@
     "stream-cache": "~0.0.1",
     "strip-ansi": "^3.0.0",
     "supports-color": "^3.1.1",
-    "webpack": ">=2.0.7-beta <3",
     "webpack-dev-middleware": "^1.4.0",
     "yargs": "^3.32.0"
   },
@@ -35,7 +34,8 @@
     "less": "^2.5.1",
     "less-loader": "~2.2.0",
     "style-loader": "~0.13.0",
-    "url-loader": "~0.5.6"
+    "url-loader": "~0.5.6",
+    "webpack": "^2.1.0-beta"
   },
   "license": "MIT",
   "repository": {