Merge pull request kubernetes#3678 from marosset/add-1.27-board-link

Add link for 1.27 enhancements tracking board

Author: k8s-ci-robot

README.md

@@ -76,7 +76,8 @@ As of the 1.26 release, enhancements from this repo are visualized in the Enhanc
 
 Links:
 
-- [1.26 Milestone](http://bit.ly/k8s126-enhancements)
+- [1.27 Milestone](https://bit.ly/k8s127-enhancements)
+- [1.26 Milestone](https://bit.ly/k8s126-enhancements)
 
 ## Enhancements Tracking Spreadsheet