add alwaysShowSend (#1173)
add alwaysShowSend (#1173)

As now the alwaysShowSend property work again, I re-add it to the docs
FaridSafi/react-native-gifted-chat,FaridSafi/react-native-gifted-messenger,FaridSafi/react-native-gifted-messenger,FaridSafi/react-native-gifted-chat