Merge branch 'sg/completion-no-column'

The completion script (in contrib/) used to list "git column"
(which is not an end-user facing command) as one of the choices

* sg/completion-no-column:
  completion: remove 'git column' from porcelain commands

diff --cc contrib/completion/git-completion.bash
index d9b9957,a795410..6956807
--- 1/contrib/completion/git-completion.bash
--- 2/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@@ -664,10 -663,11 +664,11 @@@ __git_list_porcelain_commands (
                check-mailmap)    : plumbing;;
                check-ref-format) : plumbing;;
                checkout-index)   : plumbing;;
+               column)           : internal helper;;
                commit-tree)      : plumbing;;
                count-objects)    : infrequent;;
 -              credential-cache) : credentials helper;;
 -              credential-store) : credentials helper;;
 +              credential)       : credentials;;
 +              credential-*)     : credentials helper;;
                cvsexportcommit)  : export;;
                cvsimport)        : import;;
                cvsserver)        : daemon;;