Update README.md

Author: cooperwu

README.md

@@ -16,25 +16,9 @@ Sends a DingTalk notification. Simple as that.
 action "Dingtalk notification" {
   uses = "cooperwu/action-dingtalk@master"
   secrets = ["DINGTALK_WEBHOOK"]
-  args = "A new commit has been pushed."
 }
 ```
 
-### Arguments
-
-The argument is the message to display in the Slack notification.
-
-**Environment variables** can be interpolated in the message using brackets (`{{` and `}}`) :
-
-e.g.: `Action called : {{ GITHUB_ACTION }}`
-
-*Note :* be careful to properly [format your messages for Slack](https://api.slack.com/docs/message-formatting).
-
-#### Examples
-
-* `args = "Hello, beautiful ! I ran a GitHub Actions for you <3"`
-* `args = "I showed you my commit. Please respond."`
-
 ### Secrets
 
 * **`DINGTALK_WEBHOOK`**: the Dingtalk webhook URL (**required**, see https://open-doc.dingtalk.com/docs/doc.htm).