Release v0.70.0

• [Breaking] Remove @babel/plugin-transform-regenerator from react-native-babel-preset (#789 by @tido64)
• [Breaking] Remove @babel/plugin-transform-for-of from react-native-babel-preset (#792 by @newyankeecodeshop)
• [Feature] Allow customizing the babel transform runtime version (#771 by @newyankeecodeshop)
• [Fix] Don't set a global uncaughtException listener on process (4be4099)