Bump version to 0.5.0

Author: ctavan

package.json

@@ -8,7 +8,7 @@
     "Jan Lehnardt",
     "Tim Ruffles <[email protected]>"
   ],
-  "version": "0.4.0",
+  "version": "0.5.0",
   "homepage": "https://github.com/ctavan/node-getenv",
   "repository": {
     "type": "git",