chore(package): update prettier to version 2.0.4

Closes #26

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
         "babel-plugin-transform-decorators-legacy": "^1.3.4",
         "babel-preset-es2015": "^6.22.0",
         "babel-preset-stage-0": "^6.22.0",
-        "prettier": "^1.10.2"
+        "prettier": "^2.0.4"
     },
     "dependencies": {
         "babel-polyfill": "^6.26.0",