chore(package): update prettier to version 2.0.1

Closes #150

Author: greenkeeper[bot]

package.json

@@ -96,7 +96,7 @@
     "jest": "^22.4.2",
     "jsdom": "^11.0.0",
     "postcss-sass": "^0.3.0",
-    "prettier": "^1.5.3",
+    "prettier": "^2.0.1",
     "prop-types": "^15.5.10",
     "raf": "^3.3.2",
     "react-addons-test-utils": "^15.5.1",