Update CONTRIBUTING.md (#1582)

Author: 0xTim

CONTRIBUTING.md

@@ -82,7 +82,7 @@ Please ensure to include the following in your Pull Request (PR):
 - Documentation on how these changes are being tested
 - Additional tests to show your code working and to ensure future changes don't break your code.
 
-Please keep your PRs to a minimal number of changes. If a PR is large, try to split it up into smaller PRs. Don't move code around unnecessarily as it makes comparing old with new very hard. If you have plans for a large change please talk to the maintainers of the project beforehand either on the [swift.org forums](https://forums.swift.org) in the [VS Code Swift Extension category](https://forums.swift.org/c/related-projects/vscode-swift-extension/) or in the `#vscode-swift` channel on the Swift Server Slack. You can [join the Slack workspace here](https://join.slack.com/t/swift-server/shared_invite/zt-5jv0mzlu-1HnA~7cpjL6IfmZqd~yQ2A).
+Please keep your PRs to a minimal number of changes. If a PR is large, try to split it up into smaller PRs. Don't move code around unnecessarily as it makes comparing old with new very hard. If you have plans for a large change please talk to the maintainers of the project beforehand either on the [swift.org forums](https://forums.swift.org) in the [VS Code Swift Extension category](https://forums.swift.org/c/related-projects/vscode-swift-extension/) or in the `#vscode-swift` channel on the Swift Server Slack. You can [join the Slack workspace here](https://join.slack.com/t/swift-open-source/shared_invite/zt-1a3hxb9r5-8sFU3D7JUvaP5QO1AjSivg).
 
 ### Testing