proper webpack 2 peer dependency definition. version 1.1.3

Author: Valentyn

package.json

@@ -1,6 +1,6 @@
 {
   "name": "browser-sync-webpack-plugin",
-  "version": "1.1.2",
+  "version": "1.1.3",
   "description": "BrowserSync and Webpack integration",
   "keywords": [
     "webpack",
@@ -17,7 +17,7 @@
   "devDependencies": {},
   "peerDependencies": {
     "browser-sync": "2.x.x",
-    "webpack": "1.x.x || 2.x.x"
+    "webpack": "1 || 2 || ^2.0.0-beta || ^2.1.0-beta"
   },
   "repository": {
     "type": "git",