Add Slack Integration For GH Action

Remove Travis CI

Author: dduan

Diff for: .github/workflows/slack-notify.yml

@@ -0,0 +1,13 @@
+on: push
+name: Slack Notification
+jobs:
+  slackNotification:
+    name: Slack Notification
+    runs-on: ubuntu-latest
+    steps:
+      - uses: 8398a7/action-slack@v3
+        with:
+          status: ${{ job.status }}
+          fields: repo,message,commit,author,action,eventName,ref,workflow
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}