Update grunt-contrib-uglify to version 2.3.0

FagnerMartinsBrack · FagnerMartinsBrack · commit b48e6cfeb1ab · 2017-08-19T11:00:45.000+10:00
Closes js-cookiegh-323.
diff --git a/package.json b/package.json
@@ -33,7 +33,7 @@
     "grunt-contrib-jshint": "1.1.0",
     "grunt-contrib-nodeunit": "1.0.0",
     "grunt-contrib-qunit": "2.0.0",
-    "grunt-contrib-uglify": "2.2.1",
+    "grunt-contrib-uglify": "2.3.0",
     "grunt-contrib-watch": "1.0.0",
     "grunt-jscs": "3.0.1",
     "grunt-saucelabs": "9.0.0",
