Update showcase.md
Update showcase.md

Added wagng/react-native-navigation-redux-starter-kit

Jpoliachik/react-native-navigation,guyca/react-native-navigation,3sidedcube/react-native-navigation,chicojasl/react-native-navigation,ceyhuno/react-native-navigation,guyca/react-native-navigation,chicojasl/react-native-navigation,3sidedcube/react-native-navigation,guyca/react-native-navigation,wix/react-native-navigation,guyca/react-native-navigation,Jpoliachik/react-native-navigation,thanhzusu/react-native-navigation,ceyhuno/react-native-navigation,Jpoliachik/react-native-navigation,wix/react-native-navigation,3sidedcube/react-native-navigation,thanhzusu/react-native-navigation,Jpoliachik/react-native-navigation,ceyhuno/react-native-navigation,Jpoliachik/react-native-navigation,Jpoliachik/react-native-navigation,chicojasl/react-native-navigation,thanhzusu/react-native-navigation,chicojasl/react-native-navigation,chicojasl/react-native-navigation,ceyhuno/react-native-navigation,wix/react-native-navigation,chicojasl/react-native-navigation,thanhzusu/react-native-navigation,thanhzusu/react-native-navigation,ceyhuno/react-native-navigation,3sidedcube/react-native-navigation,ceyhuno/react-native-navigation,wix/react-native-navigation,thanhzusu/react-native-navigation,wix/react-native-navigation,wix/react-native-navigation