Mention New Feature in release notes

Comes with [Git Credential Manager Core
v2.0.318.44100](https://github.com/microsoft/git-credential-manager-core/releases/tag/v2.0.318-beta).

Signed-off-by: Git for Windows Build Agent <[email protected]>

Author: Git for Windows Build Agent

ReleaseNotes.md

@@ -35,6 +35,12 @@ Git for Windows also contains Embedded CAcert Root Certificates. For more inform
 
 This package contains software from a number of other projects including Bash, zlib, curl, tcl/tk, perl, MSYS2 and a number of libraries and utilities from the GNU project, licensed under the GNU General Public License. Likewise, it contains Perl which is dual licensed under the GNU General Public License and the Artistic License.
 
+## Changes since Git for Windows v2.30.0 (December 28th 2020)
+
+### New Features
+
+* Comes with [Git Credential Manager Core v2.0.318.44100](https://github.com/microsoft/git-credential-manager-core/releases/tag/v2.0.318-beta).
+
 ## Changes since Git for Windows v2.29.2(3) (December 8th 2020)
 
 ### New Features