Fix PydocstringFormat also fixed (#123)

Author: heavenshell

ftplugin/python/pydocstring.vim

@@ -15,7 +15,7 @@ if !has('nvim') && (!has('channel') || !has('job'))
 endif
 
 command! -buffer -nargs=0 -range=0 Pydocstring call pydocstring#insert(<q-args>, <count>, <line1>, <line2>)
-command! -buffer -nargs=0 -complete=customlist,pydocstring#format PydocstringFormat call pydocstring#format()
+command! -buffer -nargs=0 PydocstringFormat call pydocstring#format()
 
 nnoremap <silent> <buffer> <Plug>(pydocstring) :call pydocstring#insert()<CR>
 if get(g:, 'pydocstring_enable_mapping', 1)