Update to 6.0.0
rP499119
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Description

Update to 6.0.0

Added a `BaseEventEmitter` class which is entirely synchronous and intended for simple use and for subclassing
Added an `AsyncIOEventEmitter` class for intended use with asyncio
Added a `TwistedEventEmitter` class for intended use with twisted
Added an `ExecutorEventEmitter` class which runs events in an executor
Deprecated `EventEmitter` (use one of the new classes)