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

arduino · Feb 4, 2022 · 10107d2 · 10107d2
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diff --git a/docs/UPGRADING.md b/docs/UPGRADING.md
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 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