add "Projects using Karmatic" section

Author: developit

README.md

@@ -48,6 +48,13 @@ karmatic '**/*Spec.jsx?'
 > Yes.
 
 
+## Projects Using Karmatic
+
+Karmatic is pretty new! Here are some projects that have switched to it you may use as a reference:
+
+- [workerize-loader](https://github.com/developit/workerize-loader/commit/afaa20bbfbdec1d6a5523ec69ba2a2d5d495cfd6)
+
+
 ## License
 
 [MIT](https://oss.ninja/mit/developit) © [developit](https://github.com/developit)