fix(package): update phantom to version 6.0.3

Closes #314

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "passport-ldapauth": "^2.0.0",
     "passport-local": "^1.0.0",
     "path": "*",
-    "phantom": "^4.0.0",
+    "phantom": "^6.0.3",
     "phantom-pool": "^1.2.2",
     "prop-types": "^15.6.0",
     "q": "*",