Update dependency prettier to v1.17.0 (#168)

Author: renovate-bot

package.json

@@ -42,7 +42,7 @@
     "builtins": "2.0.0",
     "husky": "1.3.1",
     "lint-staged": "8.1.4",
-    "prettier": "1.16.4",
+    "prettier": "1.17.0",
     "rimraf": "2.6.3",
     "rollup": "0.67.4",
     "rollup-plugin-copy": "0.2.3",