fix readme

Author: Wonday

README.md

@@ -262,7 +262,7 @@ const styles = StyleSheet.create({
 | onError       | function(error) | null        | callback when error happened | ✔   | ✔ | <3.0 |
 | onPageSingleTap   | function(page)  | null        | callback when page was single tapped | ✔ | ✔ | 3.0 |
 | onScaleChanged    | function(scale) | null        | callback when scale page | ✔ | ✔ | 3.0 |
-| onPressLink       | function(uri)   | null        | callback when link tapped | ✔ | ✔ | 5.1.? |
+| onPressLink       | function(uri)   | null        | callback when link tapped | ✔ | ✔ | 6.0.0 |
 
 #### parameters of source