chore(package): update prettier to version 2.0.1

Closes #267

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "express": "^4.17.1",
     "lerna-changelog": "^1.0.0",
     "mocha": "^7.0.1",
-    "prettier": "^1.19.1",
+    "prettier": "^2.0.1",
     "release-it": "^12.4.3",
     "release-it-lerna-changelog": "^1.0.3",
     "rimraf": "^3.0.1",