Mention Bug Fix in release notes

The fscache feature [no longer slows down `git commit -m <message>` in large worktrees](git-for-windows/git@bda7f07). Signed-off-by: Johannes Schindelin <[email protected]>
git-for-windows · May 30, 2017 · a48d15d · a48d15d
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@@ -47,6 +47,7 @@ This package contains software from a number of other projects including Bash, z
 * The documentation of Git for Windows' several config files [was improved](https://github.com/git-for-windows/git/pull/1165).
 * When interrupting Git processes in Git Bash by pressing Ctrl+C, [Git now removes `.lock` files as designed](https://github.com/git-for-windows/msys2-runtime/pull/15) ([accompanying Git PR](https://github.com/git-for-windows/git/pull/1170); this should also fix [issue #338](https://github.com/git-for-windows/git/issues/338)).
 * `git status -uno` [now treats submodules in ignored directories correctly](https://github.com/git-for-windows/git/issues/1179).
+* The fscache feature [no longer slows down `git commit -m <message>` in large worktrees](https://github.com/git-for-windows/git/commit/bda7f0728ac55e55d79ed0786c1b5ce2ef7e6117).
 
 ## Changes since Git for Windows v2.12.2(2) (April 5th 2017)