Clone a repository from my own organization, authenticate fail.
### Description

I'm trying to clone a repository from my own organization, and change my Sketch file.

However, I commit it, when I want push origin, Kactus prompt up a window, It told me that Kactus can't authenticate my Github account ,  I've reenter my username and password, still fails.

This is a public repository, am I missed something? or this feature is for Premium?
![screen shot 2017-08-14 at 5 09 10 pm](https://user-images.githubusercontent.com/4948562/29265334-4ef6536c-8113-11e7-9b96-d334304a20fe.png)

### Version

**Kactus version:** 0.2.2

**OS version:** macOS 10.13 beta 5

### Steps to Reproduce

1. Clone a organization repository.
2. Drag my file into repository folder.
3. Commit change.
4. Publish branch.
5. Get some authenticate error.