update eslint (#20)

Author: gucong3000

package.json

@@ -12,7 +12,7 @@
   },
   "description": "Mirrors in China about node.js",
   "devDependencies": {
-    "eslint": "^4.4.1",
+    "eslint": "^4.13.1",
     "mocha": "^4.0.1"
   },
   "homepage": "https://github.com/gucong3000/mirror-config-china#readme",
@@ -34,5 +34,5 @@
     "pretest": "eslint lib/**/*.js *.js",
     "test": "mocha"
   },
-  "version": "2.1.0"
+  "version": "2.2.0"
 }