Merge branch 'ek/completion-use-read-r-to-read-literally'

The completion script used to use bare "read" without the "-r"
option to read the contents of various state files, which risked
getting confused with backslashes in them.  This has been
corrected.

* ek/completion-use-read-r-to-read-literally:
  completion: suppress unwanted unescaping of `read`

diff --cc contrib/completion/git-prompt.sh
Simple merge