Update UPGRADE.md (#107)

yiisoft · May 24, 2024 · 40d3a99 · 40d3a99
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-# Yii VarDumper Upgrading Instructions
+# Upgrading Instructions for Yii VarDumper
 
-## Changes summary
+This file contains the upgrade notes. These notes highlight changes that could break your
+application when you upgrade the package from one version to another.
+
+> **Important!** The following upgrading instructions are cumulative. That is, if you want
+> to upgrade from version A to version C and there is version B between A and C, you need
+> to following the instructions for both A and B.
+
+## Upgrade from 1.x