3.0.0

Several breaking changes:

1. This package no longer works with react-navigation@2. react-navigation@3 is required. Note that we are now importing from @react-navigation/core, and have specified it as a peer dependency, so you should npm install --save @react-navigation/core or yarn add @react-navigation/core. If you're still directly importing from the react-navigation package, make sure the version of @react-navigation/core you add matches the version that node_modules/react-navigation/package.json specifies.
2. reduxifyNavigator is now createReduxContainer, to match with React Navigation 3 naming conventions.
3. The key parameter to createReduxContainer and createReactNavigationReduxMiddleware is now optional. This also means that the order of parameters to createReactNavigationReduxMiddleware has been switched.