Bash bug fixes

This release fixes some minor bugs that occur when using git-radar in Bash that have a major effect on usability.

In this release:

• #89 Cleans up error messages that occur with untracked branches
• #90 Fixes rendering of the stash indicator in Bash, which caused major rendering issues

Thanks to @matthillman and @colinsf for their contributions.

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To update to this release (on OSX):

> brew update
> brew upgrade git-radar