docs: fix link to Github issues (#1149)

Author: Koenraad Verheyden

CONTRIBUTING.md

@@ -87,7 +87,7 @@ Here are some questions that you should answer in your plan:
 
 We welcome you to use the GitHub issue tracker to report bugs or suggest features.
 
-When filing an issue, please check [existing open](https://github.com/awslabs/PRIVATE-aws-sam-development/issues), or [recently closed](https://github.com/awslabs/PRIVATE-aws-sam-development/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aclosed%20), issues to make sure somebody else hasn't already
+When filing an issue, please check [existing open](https://github.com/awslabs/serverless-application-model/issues), or [recently closed](https://github.com/awslabs/serverless-application-model/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aclosed%20), issues to make sure somebody else hasn't already
 reported the issue. Please try to include as much information as you can. Details like these are incredibly useful:
 
 - A reproducible test case or series of steps