Report bugs to Zyxel GS1900 deploy hook

This is the place to report bugs in the [Zyxel GS1900 deploy hook](https://github.com/acmesh-official/acme.sh/wiki/deployhooks#36-deploying-to-zyxel-gs1900-series-switches).

If you experience a bug with '--deploy-hook zyxel_gs1900', please report it in this issue. (Please include the '--debug' output to assist in diagnosing any problems.)

Thanks!