Git 2.5.3 发布，此版本相比 2.5.2 主要是 bug 修复：
* The experimental untracked-cache feature were buggy when paths with
a few levels of subdirectories are involved.
* Recent versions of scripted “git am” has a performance regression
in “git am –skip” codepath, which no longer exists in the
built-in version on the ‘master’ front. Fix the regression in
the last scripted version that appear in 2.5.x maintenance track