Bump prettier from 1.19.1 to 2.0.1

Bumps [prettier](https://github.com/prettier/prettier) from 1.19.1 to 2.0.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@1.19.1...2.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -98,7 +98,7 @@
     "loader.js": "^4.7.0",
     "normalize.css": "^8.0.1",
     "nyc": "^15.0.0",
-    "prettier": "^1.19.1",
+    "prettier": "^2.0.1",
     "qunit-console-grouper": "^0.2.0",
     "qunit-dom": "^1.1.0",
     "sass": "^1.26.3",