Mention New Feature in release notes

Comes with Git-Flow
[v1.10.2](https://github.com/petervanderdoes/gitflow-avh/blob/1.10.2/Changes.mdown#1102)
(addressing [#1092](git-for-windows/git#1092)
via [this Pull
Request](git-for-windows/MSYS2-packages#20)).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

ReleaseNotes.md

@@ -43,6 +43,7 @@ A [MinGit-only v2.12.0(2)](https://github.com/git-for-windows/git/releases/tag/v
 * Git for Windows now bundles [Git LFS](https://git-lfs.github.com/).
 * Comes with Git Credential Manager [v1.9.0](https://github.com/Microsoft/Git-Credential-Manager-for-Windows/releases/tag/v1.9.0).
 * Git can now be configured to use [Secure Channel](https://github.com/git-for-windows/git/issues/301) to use the Windows Credential Store when fetching/pushing via HTTPS.
+* Comes with Git-Flow [v1.10.2](https://github.com/petervanderdoes/gitflow-avh/blob/1.10.2/Changes.mdown#1102) (addressing [#1092](https://github.com/git-for-windows/git/issues/1092) via [this Pull Request](https://github.com/git-for-windows/MSYS2-packages/pull/20)).
 
 ### Bug Fixes