Here's a list of all the changes made in this release; the full changelog can be found in History.md:

• (90ba942) add Gitter badge to README – @qw3rtman
• (#495) update Windows installation instructions – @JanSchulz
• (#494) fix inverted list of commands that use is_git_repo in Makefile – @apjanke
• (#499) add BSD instalation instructions – @qw3rtman
• (#496, #497) improve Windows installer – @JanSchulz
• (#500) add git-sync command – @kumon
• (#506) update git-pr usage in documentation – @rstacruz
• (#507) regenerate git-pr.html – @rstacruz
• (#503) allow GIT-EDITOR to contain spaces for git-changelog command – @spacewander

Since the last release (v4.0.0 wookiee):

• added 1 new command (git-sync)
• updated man pages or documentation 5 times
• fixed installation/update scripts 3 times
• 6 unique contributors

Next projected release on February 29.