[skip changelog] Update UPGRADING.md for 0.21.0 (#1655)

silvanocerza · web-flow · commit 10107d2407c2 · 2022-02-04T16:58:59.000+01:00
diff --git a/docs/UPGRADING.md b/docs/UPGRADING.md
@@ -2,7 +2,7 @@
 
 Here you can find a list of migration guides to handle breaking changes between releases of the CLI.
 
-## Unreleased
+## 0.21.0
 
 ### `packagemanager.NewPackageManager` function change
 
