chore(package): update prettier to version 2.0.5

Closes #10

Author: greenkeeper[bot]

package.json

@@ -37,6 +37,6 @@
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-prettier": "^2.5.0",
     "pre-commit": "1.2.2",
-    "prettier": "^1.10.2"
+    "prettier": "^2.0.5"
   }
 }