Update README.md

README.md

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 ## NOTES:
-
+- current latest version: v7.x
 - for iOS SDK < 4, use react-native-fcm@6.2.3 (v6.x is still compatible with Firebase SDK v4)
-- for latest RN, use latest react-native-fcm
 - for RN < 0.40.0, use react-native-fcm@2.5.6
 - for RN < 0.33.0, use react-native-fcm@1.1.0
 - for RN < 0.30.0, use react-native-fcm@1.0.15