chore(package): update prettier to version 2.0.3

Closes #16

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
     "html-webpack-plugin": "^3.2.0",
     "husky": "^0.14.3",
     "postcss-loader": "^2.1.6",
-    "prettier": "^1.14.0",
+    "prettier": "^2.0.3",
     "webpack": "^4.16.2",
     "webpack-cli": "^3.1.0",
     "webpack-dev-server": "^3.1.5"