Update config.yml

Author: stephencelis

.github/ISSUE_TEMPLATE/config.yml

@@ -1,7 +1,7 @@
 blank_issues_enabled: false
 
 contact_links:
-  - name: Discussion
+  - name: Project Discussion
     url: https://github.com/pointfreeco/swift-composable-architecture/discussions
     about: Composable Architecture Q&A, ideas, and more
   - name: Documentation
@@ -10,3 +10,6 @@ contact_links:
   - name: Videos
     url: https://www.pointfree.co/collections/composable-architecture
     about: Watch videos to get a behind-the-scenes look at how the Composable Architecture was motivated and built
+  - name: Slack
+    url: http://pointfree.co/slack-invite
+    about: Community chat