disconnectAllSessions now works with recent versions of Swift
disconnectAllSessions now works with recent versions of Swift

I don't know much about React Native bridges, so you guys might want to check my work here. I was getting [this error](https://stackoverflow.com/questions/39692230/got-is-not-a-recognized-objective-c-method-when-bridging-swift-to-react-native) when trying to execute `disconnectAllSessions`. Adding the `_` appears to have fixed it.
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