Added Slack link

Author: corneliusyaovi

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: SDK Integration Support
-    url: https://developer.flutterwave.com/
+    url: https://bit.ly/34Vkzcg
     about: If you're having general trouble with your integration, Kindly contact our support team.