Remove unused dependency

Author: jakezatecky

package.json

@@ -42,7 +42,6 @@
     "gulp-eslint": "^3.0.1",
     "gulp-header": "^1.8.8",
     "gulp-mocha": "^3.0.1",
-    "gulp-mocha-phantomjs": "^0.12.0",
     "gulp-sass": "^3.0.0",
     "gulp-scss-lint": "^0.4.0",
     "mocha": "^3.0.2",