Update README.md

Fix call to setApplicationIconBadgeNumber

added big picture style to android notification

Recommend staying on iOS SDK v3

Provide collapse_key, from, mesage_id, and send_time in foreground notificaitons

doc(readme) : add missing settings

Update README.md

Update READ.ME with correct diff for dependencies

by just adding a key called picture to  the notification payload, we can
display image on android notification.

Added copy-to-clipboard feature for token

remove unneeded intent

Update android buildToolsVersion to 25.0.2

When I first configured react-native-fcm I missed the compile project(':react-native-fcm') line because it's not stated as change in the diff viewer. corrected this