Remove out of date reference to ResponderEventPlugin.js

[rickschubert]

The file ResponderEventPlugin.js is nowhere to be found in the source code of react-native although it is referenced by name 33 times in 6 files. ResponderEventPlugin can be found inside of Libraries\Renderer\ReactNativeRenderer-prod.js though.

Having had a look at ReactNativeRenderer-prod.js I realised that there are neither details nor documentation inside of this file. Thus, I would propose to completely remove this sentence.

#125

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[stale]

Closing this issue after a prolonged period of inactivity. If this issue is still present in the latest release, please feel free to create a new issue with up-to-date information.