fix(npm): updates phantomjs requirement

package.json

@@ -51,7 +51,7 @@
     "karma-phantomjs-launcher": "0.2.1",
     "load-grunt-tasks": "3.4.0",
     "mocha": "2.3.4",
-    "phantomjs": "~2.1.3",
+    "phantomjs": "^2.1.3",
     "reflect-metadata": "0.1.2",
     "rxjs": "5.0.0-beta.0",
     "sass-lint": "^1.5.0",