chore(package.json): Update dependency prettier to v2.1.2

Author: renovate-bot

package.json

@@ -81,7 +81,7 @@
     "lint-staged": "10.3.0",
     "mocha": "7.2.0",
     "nightmare": "3.0.2",
-    "prettier": "2.0.5",
+    "prettier": "2.1.2",
     "rimraf": "3.0.2",
     "semantic-release": "15.14.0",
     "shelljs": "0.8.3",