docs: link direcly to the docs on webpack.js.org (#68)

Author: graingert

package.json

@@ -56,7 +56,7 @@
   "engines": {
     "node": ">= 4.3 < 5.0.0 || >= 5.10"
   },
-  "homepage": "https://webpack.js.org",
+  "homepage": "https://webpack.js.org/plugins/compression-webpack-plugin/",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/webpack-contrib/compression-webpack-plugin.git"