Revert "set minSdkVersion to 16."
Revert "set minSdkVersion to 16."

This reverts commit ce851d8841a26adcbab9068107c3a30d99cd4668.

ccm-innovation/react-native-twilio-ip-messaging,ccm-innovation/react-native-twilio-chat,ccm-innovation/react-native-twilio-ip-messaging,ccm-innovation/react-native-twilio-chat,ccm-innovation/react-native-twilio-chat,ccm-innovation/react-native-twilio-ip-messaging