update upgrade notes

UPGRADING.md

@@ -1,21 +1,26 @@
 From 2.x to 3.0.0
-====================
+=================
+
+Upgrading from 2.x to 3.x should require almost no effort.
+
+The only change is the revert of "deeper branch group exclusion strategy" introduced in 2.0.0 and now reverted as it
+was in 1.x. If you are not using this feature, then upgrading requires no changes at all.
 
-The "deeper branch group exclusion strategy" change introduced in 2.0.0 has been reverted, 
-now it behaves as it as in 1.x.
+The deprecations introduced in 2.x are still present in 3.0.0, said feature are most likley to be removed in an next major. 
 
 From 1.x to 3.0.0
-====================
+=================
 
-Please follow the upgrade **"From 1.12.0 to 2.0.0"**, skipping the section:
+Please follow the upgrade **"From 1.13.0 to 2.0.0"**, skipping the section:
 
 > "deeper branch group exclusion strategy" has a different behaviour, the latest group is used instead of falling back to "Default"
 
-From 1.12.0 to 2.0.0
+The deprecations introduced in 2.x are still present in 3.0.0, said feature are most likley to be removed in an next major.
+
+From 1.13.0 to 2.0.0
 ====================
 
-Upgrading from 1.x to 2.x should be almost transparent for most of the userland code, 
-in case you have heavily used internal-api here are the most important the changes:
+If you are on version `1.x`, is suggested to migrate directly to `3.0.0` (since `2.x` is not maintained anymore).
 
 **Main changes**