Fix missing space in completion message

Author: tpope

autoload/dispatch.vim

@@ -1231,7 +1231,7 @@ function! dispatch#complete(file, ...) abort
       echohl DispatchCompleteMsg
       let label = 'Complete:'
     endif
-    call s:echo_truncated(label . '!', request.expanded . ' ' . s:postfix(request))
+    call s:echo_truncated(label . ' !', request.expanded . ' ' . s:postfix(request))
     echohl NONE
     if !a:0
       checktime