chore(package): update prettier to version 2.0.3

Closes #85

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "@types/node": "^12.6.8",
     "cz-conventional-changelog": "^3.0.2",
     "husky": "^3.0.5",
-    "prettier": "^1.18.2",
+    "prettier": "^2.0.3",
     "shx": "^0.3.2",
     "tslint": "5.18.0",
     "uglifyjs-folder": "^1.5.1",