Bump prettier from 1.18.2 to 1.19.1 (open-sauced#414)

Bumps [prettier](https://github.com/prettier/prettier) from 1.18.2 to 1.19.1.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@1.18.2...1.19.1)

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

package.json

@@ -85,7 +85,7 @@
     "graphql": "^14.5.8",
     "onegraph-apollo-client": "^2.1.0",
     "onegraph-auth": "^2.1.1",
-    "prettier": "1.18.2",
+    "prettier": "1.19.1",
     "promisingagent": "5.3.2",
     "react": "^16.10.2",
     "react-apollo": "^3.1.3",