fix for older git versions
authorChris Koeritz <fred@gruntose.com>
Sun, 7 Jan 2018 17:48:41 +0000 (12:48 -0500)
committerChris Koeritz <fred@gruntose.com>
Wed, 10 Jan 2018 20:01:12 +0000 (15:01 -0500)
checking the version so we don't try to use autostash before it is available.


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