chore: update dev deps

Author: PatrickJS

package.json

@@ -48,6 +48,7 @@
     "angular-animate": "^1.3.13",
     "browserify": "^13.0.0",
     "browserify-ngannotate": "^2.0.0",
+    "bufferutil": "^1.2.1",
     "jasmine-core": "^2.3.4",
     "karma": "^0.13.22",
     "karma-chrome-launcher": "^0.2.3",
@@ -62,6 +63,7 @@
     "phantomjs": "^2.1.3",
     "phantomjs-prebuilt": "^2.1.7",
     "requirejs": "^2.1.16",
-    "uglify-js": "^2.4.16"
+    "uglify-js": "^2.4.16",
+    "utf-8-validate": "^1.2.1"
   }
 }