chore(package): update prettier to version 2.0.3

Closes #177

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "conventional-changelog-cli": "^2.0.27",
     "enzyme": "^3.10.0",
     "enzyme-adapter-react-16": "^1.15.1",
-    "prettier": "^1.18.2",
+    "prettier": "^2.0.3",
     "react-test-renderer": "^16.6.0",
     "sinon": "^5.0.10"
   },