Merge pull request brianc#1374 from charmander/node-minor-compatibility

Update minimum Node version to 4.5.0

Author: brianc

package.json

@@ -43,6 +43,6 @@
   },
   "license": "MIT",
   "engines": {
-    "node": ">= 4.0.0"
+    "node": ">= 4.5.0"
   }
 }