Support webpack 2.2-rc (#695)

Author: graingert

resolvers/webpack/package.json

@@ -43,7 +43,7 @@
   },
   "peerDependencies": {
     "eslint-plugin-import": ">=1.4.0",
-    "webpack": "^1.11.0 || ^2.1.0-beta || ^2.1.0"
+    "webpack": "^1.11.0 || ^2.1.0-beta || ^2.1.0 || ^2.2.0-rc"
   },
   "devDependencies": {
     "chai": "^3.4.1",