Fix a typo in README.md

Author: ShreckYe

README.md

@@ -43,7 +43,7 @@ There is no plan to support Apple platforms until there is official support from
 - `Text`/`MaterialText`
 - `TopAppBarScaffold`
 
-### styles
+### Styles
 
 The `ModifierOrAttrsScope.styles` function and the `StyleScope` class provide a universal interface for `Modifier`s and CSS styles.