DingTalk util
钉钉机器人 Rust SDK
```rust
pub fn main() -> Result<(), Box
Ok(())
} ```
DingTalk::from_file
, read token from fileDefault::default()
supportset_default_webhook_url
, default dingtalk webhook urlDingTalk::send_link(...)
, send link messageDingTalkMessage
, can set atall, atmobiles now