Bash script for a simpler Trello integration in Zulip

Usage :

1. Fill the needed information in zulip_trello_webhook.sh :

   • The bot API KEY,
   • The Trello API KEY,
   • The Trello TOKEN,
   • The Zulip host

2. Make the script executable :

   $ chmod +x zulip_trello_webhook.sh

3. Call the script : 

   $ ./zulip_trello_webhook.sh [stream_name] [trello_board_name] [trello_board_short_id]

Pull requests and improvements or tips are welcome.