docs: Add note to changelog linking migration guide

AbhiPrasad · web-flow · commit c7d37650cee5 · 2024-07-02T18:12:11.000-04:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+> [!IMPORTANT]  
+> If you are upgrading to the `8.x` versions of the SDK from `7.x` or below, make sure you follow our [migration guide](https://docs.sentry.io/platforms/javascript/migration/) first.
+
 ## Unreleased
 
 - "You miss 100 percent of the chances you don't take. — Wayne Gretzky" — Michael Scott
