v0.7.13

Changelog

f8e6578 Add support for GitHub Enterprise
304cb46 Automatically close pull requests for commits which are removed from stack
2577e33 Disable homebrew for CD
a571fbf Publish linux packages to gemfury repo
4138f27 Re-enable brew, run CD on macos
e97e273 add githubHost to readme
ee59f38 nice error message for 401 unauthorized case