Lint check during PR ?

<img width="824" alt="image" src="https://user-images.githubusercontent.com/3314607/52521092-2a5ad300-2c72-11e9-961e-c25df0ba666c.png">

Ok, it needs a PR, but I vote for lint error check during PR

### PRs: 

https://github.com/owncloud/android/pull/2736