update discord link

README.md

@@ -203,7 +203,7 @@ from anyone on the internet, and are grateful for even the smallest of fixes!
 
 If you'd like to contribute to bsc, please fork, fix, commit and send a pull request
 for the maintainers to review and merge into the main code base. If you wish to submit
-more complex changes though, please check up with the core devs first on [our discord channel](https://discord.com/invite/T3Ka4V4N)
+more complex changes though, please check up with the core devs first on [our discord channel](https://discord.gg/5Z3C3SdxDw)
 to ensure those changes are in line with the general philosophy of the project and/or get
 some early feedback which can make both your efforts much lighter as well as our review
 and merge procedures quick and simple.