chore(deps): update dependency prettier to v2

Author: renovate-bot

package-lock.json

@@ -128,7 +128,7 @@
     "lint-staged": "7.3.0",
     "pre-commit": "1.2.2",
     "pre-push": "0.1.1",
-    "prettier": "1.15.2",
+    "prettier": "2.0.5",
     "prettier-check": "2.0.0",
     "rollup": "1.32.1",
     "rollup-plugin-invariant": "0.5.6",