chore(package): update lerna to version 2.3.0

Closes #328

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "html-loader": "0.4.5",
     "html-webpack-plugin": "2.28.0",
     "husky": "0.13.3-0",
-    "lerna": "2.0.0-beta.38",
+    "lerna": "2.3.0",
     "lerna-semantic-release": "9.0.7",
     "lodash.capitalize": "4.2.1",
     "markdown-loader": "2.0.0",