Mention Bug Fix in release notes

When pseudo console support is enabled, [the
VIM editor sometimes had troubles accepting certain
keystrokes](git-for-windows/git#2689),
which was fixed.

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

Author: dscho

ReleaseNotes.md

@@ -48,6 +48,7 @@ This package contains software from a number of other projects including Bash, z
 * Some Git operations [could end up with bogus modified symbolic links](https://github.com/git-for-windows/git/issues/2653) (where `git status` would report changes but `git diff` would not), which is now fixed.
 * When reinstalling (or upgrading) Git for Windows, [the "Pseudo Console Support" choice is now remembered correctly](https://github.com/git-for-windows/build-extra/pull/295).
 * Under certain circumstances, the Git Bash window (MinTTY) [would crash frequently](https://github.com/git-for-windows/git/issues/2687), which has been addressed.
+* When pseudo console support is enabled, [the VIM editor sometimes had troubles accepting certain keystrokes](https://github.com/git-for-windows/git/issues/2689), which was fixed.
 
 ## Changes since Git for Windows v2.26.2 (April 20th 2020)