use uglify-js 2.x

README.md

@@ -2,8 +2,6 @@
 
 # Ajv: Another JSON Schema Validator
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/epoberezkin/ajv.svg)](https://greenkeeper.io/)
-
 The fastest JSON Schema validator for node.js and browser with draft 6 support.
 
 
@@ -12,6 +10,7 @@ The fastest JSON Schema validator for node.js and browser with draft 6 support.
 [![npm downloads](https://img.shields.io/npm/dm/ajv.svg)](https://www.npmjs.com/package/ajv)
 [![Code Climate](https://codeclimate.com/github/epoberezkin/ajv/badges/gpa.svg)](https://codeclimate.com/github/epoberezkin/ajv)
 [![Coverage Status](https://coveralls.io/repos/epoberezkin/ajv/badge.svg?branch=master&service=github)](https://coveralls.io/github/epoberezkin/ajv?branch=master)
+[![Greenkeeper badge](https://badges.greenkeeper.io/epoberezkin/ajv.svg)](https://greenkeeper.io/)
 [![Gitter](https://img.shields.io/gitter/room/ajv-validator/ajv.svg)](https://gitter.im/ajv-validator/ajv)
 
 

package.json

@@ -93,7 +93,7 @@
     "regenerator": "0.9.7",
     "require-globify": "^1.3.0",
     "typescript": "^2.0.3",
-    "uglify-js": "3.0.0",
+    "uglify-js": "^2.6.1",
     "watch": "^1.0.0"
   }
 }