Needs updating to work with sketch 52 
I cant seem to get the plugin to work with sketch 52
<img width="2854" alt="screenshot 2018-10-03 at 13 28 26" src="https://user-images.githubusercontent.com/43187049/46407778-4a9ce300-c710-11e8-91a3-ea7f38fbc90c.png">
