Update CONTRIBUTING.md

Co-authored-by: ijemmy <[email protected]>

Author: dreamorosi

CONTRIBUTING.md

@@ -32,7 +32,7 @@ reported the issue. Please try to include as much information as you can. Detail
 
 Contributions via pull requests are much appreciated.
 
-### TL;DR;
+### Summary
 * This project uses `[email protected]` and `[email protected]` for development (see [Setup](#setup))
 * Before opening a PR, find an existing issue or open a new one to discuss the proposed change. PR without an issue or discussion has high risk of being rejected. We don't want to you to waste time. And it is very uncomfortable for us to reject a PR
 * After your proposal has been reviewed and accepted by at least one of the project's maintainers, you can submit a pull request