Mention Bug Fix in release notes

During a run of `git rebase --rebase-merges`,
the output of `git status` [now shows `label` lines
correctly](git-for-windows/git#2185), i.e. with
the labels' names instead of the commit hash they point to.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

ReleaseNotes.md

@@ -62,6 +62,7 @@ This package contains software from a number of other projects including Bash, z
 * `git difftool --no-index` [can now be run outside of Git worktrees](https://github.com/git-for-windows/git/pull/2175).
 * `gitk` [now works correctly](https://github.com/git-for-windows/git/pull/2170) in the presence of a large number of branches/tags.
 * `git rebase -i` used to get confused when an `exec` command created new commits and then appended `pick` lines for them. This [has been fixed](https://github.com/git-for-windows/git/pull/2121).
+* During a run of `git rebase --rebase-merges`, the output of `git status` [now shows `label` lines correctly](https://github.com/git-for-windows/git/pull/2185), i.e. with the labels' names instead of the commit hash they point to.
 
 ## Changes since Git for Windows v2.20.1 (December 15th 2018)