Merge pull request #1027 from chrisbra/hg

Add mq patch to branch output for hg

autoload/airline/extensions/branch.vim

@@ -102,7 +102,13 @@ endfunction
 
 function! s:get_hg_branch()
   if s:has_lawrencium
-    return lawrencium#statusline()
+    let stl=lawrencium#statusline()
+    let mq=system('hg qtop')
+    if v:shell_error==0 && !empty(stl)
+      let mq=matchstr(mq, '.*\ze\n') 
+      return printf("%s/%s", stl, mq)
+    endif
+    return stl
   endif
   return ''
 endfunction