chore: remove unused phantomjs

Author: fitzhavey

package.json

@@ -38,7 +38,6 @@
  "isparta": "^4.0.0",
  "isparta-loader": "^2.0.0",
  "node-sass": "^4.13.1",
- "phantomjs": "^2.1.7",
  "sass-loader": "^3.1.2",
  "style-loader": "^0.13.0",
  "url-loader": "^0.5.7",