Send message to dingtalk.
   
   Please access https://developers.dingtalk.com/document/app/message-type for more more details.
   
   # Setup
   (def access-token "1fe1840503d9cb76277a48d79e9aa629ee6519e6437cd4aeeef194659ef4703a")
   (def secret "SEC0068c84057217b3b8a32eeaa31d64b5c492116f431a7b641fa5558380661c81b")
   (setup-dingtalk access-token secret)
   
   # Send text message
   (send-text-msg! "This is a test.")
   
   # Send link message
   (send-link-msg! "EXAMPLE" "This is a description for the link message" 
                   "https://dbd0040.blob.core.windows.net/images/Example_MyTicket.jpg" 
                   "https://myticket.co.uk/artists/example")
   
   # Send markdown message
   (send-markdown-msg! "首屏会话透出的展示内容" "# 这是支持markdown的文本 
## 标题2  
* 列表1 
![alt 啊](https://img.alicdn.com/tps/TB1XLjqNVXXXXc4XVXXXXXXXXXX-170-64.png)")
   
   # Send action card message
   (send-action-card! "是透出到会话列表和通知的文案" "支持markdown格式的正文内容" "查看详情" "https://open.dingtalk.com")