update new slack channel name

Signed-off-by: caozhuozi <543481992@qq.com>

Author: caozhuozi

README.md

@@ -25,7 +25,7 @@ Apache 2.0 License. Please see [LICENSE](LICENSE) for more information.
 
 ## Community, Support, Discussion
 
-You can engage with this project by joining the discussion on our Slack channel: [#model-spec-discussion](https://cloud-native.slack.com/archives/C07T0V480LF) in the [CNCF Slack workspace](https://slack.cncf.io/).
+You can engage with this project by joining the discussion on our Slack channel: [#modelpack](https://cloud-native.slack.com/archives/C07T0V480LF) in the [CNCF Slack workspace](https://slack.cncf.io/).
 
 ## Contributing