Update dependency prettier to v1.19.1 (#230)

Author: renovate-bot

package.json

@@ -49,7 +49,7 @@
     "husky": "3.0.7",
     "lint-staged": "9.4.2",
     "np": "5.1.3",
-    "prettier": "1.18.2",
+    "prettier": "1.19.1",
     "rimraf": "3.0.0",
     "rollup": "0.67.4",
     "rollup-plugin-copy": "3.1.0",