README: add install instructions for webpack 2

webpack-contrib · Feb 16, 2017 · 52950f3 · 52950f3
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diff --git a/README.md b/README.md
@@ -18,7 +18,10 @@
 <h2 align="center">Install</h2>
 
 ```bash
+# for webpack 1
 npm install --save-dev extract-text-webpack-plugin
+# for webpack 2
+npm install --save-dev extract-text-webpack-plugin@beta
 ```
 
 <h2 align="center">Usage</h2>