right number of arguments for :VimuxRunCommand

(read docs)

Author: teoric

plugin/vimux.vim

@@ -3,7 +3,7 @@ if exists("g:loaded_vimux") || &cp
 endif
 let g:loaded_vimux = 1
 
-command -nargs=1 VimuxRunCommand :call VimuxRunCommand(<args>)
+command -nargs=2 VimuxRunCommand :call VimuxRunCommand(<args>)
 command VimuxRunLastCommand :call VimuxRunLastCommand()
 command VimuxCloseRunner :call VimuxCloseRunner()
 command VimuxZoomRunner :call VimuxZoomRunner()