Merge branch 'bc/completion-for-bash-3.0'

* bc/completion-for-bash-3.0:
  git-completion.bash: replace zsh notation that breaks bash 3.X

Author: gitster

contrib/completion/git-completion.bash

@@ -2581,7 +2581,7 @@ if [[ -n ${ZSH_VERSION-} ]]; then
 				--*=*|*.) ;;
 				*) c="$c " ;;
 				esac
-				array+=("$c")
+				array[$#array+1]="$c"
 			done
 			compset -P '*[=:]'
 			compadd -Q -S '' -p "${2-}" -a -- array && _ret=0