Removed phantomjs-prebuilt from direct dependencies

Author: n1474335

package.json

@@ -110,7 +110,6 @@
     "node-md6": "^0.1.0",
     "nwmatcher": "^1.4.4",
     "otp": "^0.1.3",
-    "phantomjs-prebuilt": "^2.1.16",
     "popper.js": "^1.14.4",
     "scryptsy": "^2.0.0",
     "snackbarjs": "^1.1.0",