Changes

Support multiple arguments to the payload through a new Payload variant called
Text that holds a JSON value (#384).
Credits to ctrlaltf24@ and SalahaldinBilal@!
Please note: This is a breaking change: Payload::String is deprecated and will be removed soon.
Async reconnections: Support for automatic reconnection in the async version of the crate!
(#400). Credits to rageshkrishna@.
Add an on_reconnect callback that allows to change the connection configuration
(#405). Credits to rageshkrishna@.
Fix bug that ignored the ping interval (#359).
Credits to sirkrypt0@.
This is a breaking change that removes the engine.io's stream impl.
It is however replaced by a method called as_stream on the engine.io socket.
Add macro async_callback and async_any_callback for async callbacks (#399.
Credits to shenjackyuanjie@.

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