chore: update dependency prettier to v1.19.1

Author: renovate-bot

package-lock.json

@@ -107,7 +107,7 @@
     "eslint-config-prettier": "6.4.0",
     "eslint-plugin-prettier": "3.1.1",
     "flow-bin": "0.110.0",
-    "prettier": "1.18.2",
+    "prettier": "1.19.1",
     "react-docgen": "3.0.0-beta12",
     "rimraf": "2.7.1",
     "test-all-versions": "3.3.3"