Merge pull request #111 from unexpectedjs/depfu/update/npm/prettier-2.2.0

Upgrade prettier to version 2.2.0

Author: papandreou

package.json

@@ -52,7 +52,7 @@
     "mock-fs": "^4.0.0",
     "nyc": "^15.0.0",
     "offline-github-changelog": "^2.0.0",
-    "prettier": "~2.1.0",
+    "prettier": "~2.2.0",
     "unexpected": "^12.0.0",
     "unexpected-documentation-site-generator": "^6.0.0",
     "unexpected-markdown": "^5.0.0",