Update README: clarify core idea

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ivanvorobei

README.md

@@ -1,6 +1,6 @@
 # DiffableKit
 
-Wrapper around `UITableViewDiffableDataSource` and `UICollectionViewDiffableDataSource`. Removes boilerplate — describe sections and rows as models, get animated updates out of the box.
+Wrapper around `UITableViewDiffableDataSource` and `UICollectionViewDiffableDataSource`. Just call `set()` with your content whenever something changes — diffing, animations, and cell updates are handled automatically under the hood.
 
 Built-in row types for settings screens. Cell provider, header/footer provider, delegate with actions — all wired up declaratively.