chore: drop support for Node.js 0.10

BREAKING CHANGE: This module no longer supports Node.js 0.10

package.json

@@ -3,7 +3,7 @@
   "version": "0.0.17",
   "private": true,
   "engines": {
-    "node": ">= 0.10.x",
+    "node": ">= 4",
     "npm": ">= 1.1.x"
   },
   "dependencies": {