Add engines section. node >= 0.10

Author: Arttse

package.json

@@ -6,6 +6,9 @@
   "scripts": {
     "test": "xo && ava"
   },
+  "engines": {
+    "node": ">=0.10"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/Arttse/node.is-url-protocol-without-slashes.git"