remove "-complete=expression" with -nargs=0 (#1097)

fix: Remove `-complete` when using `-nargs=0`

Newer versions of Vim/Neovim throw error when using -complete with
-nargs=0

https://github.com/neoclide/coc.nvim/issues/3414
https://github.com/neoclide/coc.nvim/pull/3210

src/bridge/mod.rs

@@ -109,7 +109,7 @@ pub fn build_neovide_command(channel: u64, num_args: u64, command: &str, event:
     };
     if num_args == 0 {
         return format!(
-            "command! -nargs={} -complete=expression {} call rpcnotify({}, 'neovide.{}')",
+            "command! -nargs={} {} call rpcnotify({}, 'neovide.{}')",
             nargs, command, channel, event
         );
     } else {