The Git distributed revision control system was updated to version 2.12.0, which
brings several fixes and enhancements.

- Use of an empty string that is used for 'everything matches' is still warned and Git
asks users to use a more explicit '.' for that instead. In the future this warning
will be turned into a hard error.
- The historical argument order "git merge 'msg' HEAD 'commit'..." has been deprecated
for quite some time, and will be removed in a future release.
- An ancient script "git relink" has been removed.
- The character width table has been updated to match Unicode 9.0.
- Commands in the "git diff" and "git log" family by default enable rename detection;
use "diff.renames" configuration variable to disable this.
- Merging two branches that have no common ancestor with "git merge" is by default
forbidden now to prevent creating such an unusual merge by mistake.
- Output formats of "git log" that indents the commit log message by 4 spaces now
expands HT in the log message by default. The "--no-expand-tabs" option disables this.
- "git send-email" now uses a more readable timestamps when formulating a message ID.
- The rsync:// transport has been removed.
- "git fetch" and friends that make network connections can now be told to only use
ipv4 (or ipv6).
- Add support for talking http/https over socks proxy.