Add a release note (feature)

Comes with [tig
v2.5.8](https://github.com/jonas/tig/releases/tag/tig-2.5.8).

Signed-off-by: gitforwindowshelper[bot] <[email protected]>

Author: gitforwindowshelper[bot]

ReleaseNotes.md

@@ -45,6 +45,7 @@ This package contains software from a number of other projects including Bash, z
 ### New Features
 
 * In the olden Git days, there were "dashed" Git commands (e.g. `git-commit` instead of `git commit`). These haven't been supported for interactive use in a really, really long time. But they still worked in Git aliases and hooks ("scripts"). Since Git v1.5.4 (released on February 2nd, 2008), it was discouraged/deprecated to use dashed Git commands even in scripts. As of this version, Git for Windows [no longer supports these dashed commands](https://github.com/git-for-windows/git/pull/4252).
+* Comes with [tig v2.5.8](https://github.com/jonas/tig/releases/tag/tig-2.5.8).
 
 ### Bug Fixes