Merge pull request #163 from pre-commit/update_no_cover_for_appveyor

appveyor installed git-lfs, fix coverage

Author: asottile

pre_commit_hooks/check_added_large_files.py

@@ -15,7 +15,7 @@
 def lfs_files():
     try:  # pragma: no cover (no git-lfs)
         lines = cmd_output('git', 'lfs', 'status', '--porcelain').splitlines()
-    except CalledProcessError:
+    except CalledProcessError:  # pragma: no cover (with git-lfs)
         lines = []
 
     modes_and_fileparts = [