Merge pull request react-navigation#270 from mdchristians/state-persistence-blog-link

State Persistence Blog Link Updated

Author: brentvatne

website/blog/2018-04-06-react-navigation-2.0-rc.md

@@ -71,6 +71,6 @@ This change was made to improve the ease of learning and understanding the libra
 
 ## New feature highlights
 
-- State persistence - automatically save state and reload it when the app restarts. See https://v2.reactnavigation.org/docs/en/state-persistence.html
+- State persistence - automatically save state and reload it when the app restarts. See https://reactnavigation.org/docs/en/state-persistence.html
 - Transitions between screens in stack with headers and without headers now animates as expected on iOS. https://github.com/react-navigation/react-navigation/pull/3821. Thanks [skevy](https://github.com/skevy)!
 - As mentioned above, `createMaterialBottomNavigator` is a new navigator type that provides the material design bottom tab bar pattern.