installer: correction in release notes

The release notes of the latest installer are still referring to the
previous git version. Lets fix this.

Signed-off-by: 마누엘 <nalla@hamal.uberspace.de>

Author: 마누엘

installer/ReleaseNotes.md

@@ -33,7 +33,7 @@ This package contains software from a number of other projects including zlib, c
 
 ###New Features
 
-* Comes with Git 2.4.5
+* Comes with Git 2.4.6
 
 ###Bug fixes