Error message missing information

[HegerM]

I was trying to push to a repo where I didn't have write access and got a 403 error. The error message in GitUp only says "unexpected HTTP status code: 403". When using git from the shell, it also shows "remote: Write access to repository not granted."

Obviously that would be very valuable information to include in the error popup in gitup as well.

[lucasderraugh]

I'd have to see if we actually know that information in the API, but good suggestion.