node 4 is now officially minimum version

sidorares · sidorares · commit 43a041fe657b · 2017-05-29T10:40:00.000+10:00
diff --git a/package.json b/package.json
@@ -40,7 +40,7 @@
     "promise.js"
   ],
   "engines": {
-    "node": ">= 0.10"
+    "node": ">= 4.0"
   },
   "author": "Andrey Sidorov <sidorares@yandex.ru>",
   "license": "MIT",
