Update README.md

Author: szczepanmasny

README.md

@@ -50,3 +50,7 @@ npm run build --report
 
 For a detailed explanation on how things work, check out the [guide](http://vuejs-templates.github.io/webpack/) and [docs for vue-loader](http://vuejs.github.io/vue-loader).
 
+## License
+[MIT](https://opensource.org/licenses/MIT)
+
+Copyright (c) 2018-present, Szczepan Masny