add link to 1.34 tracking board

Author: jenshu

README.md

@@ -76,6 +76,7 @@ As of the 1.26 release, enhancements from this repo are visualized in the Enhanc
 
 Links:
 
+- [1.34 Milestone](https://bit.ly/k8s134-enhancements)
 - [1.33 Milestone](https://bit.ly/k8s133-enhancements)
 - [1.32 Milestone](https://bit.ly/k8s132-enhancements)
 - [1.31 Milestone](https://bit.ly/k8s131-enhancements)