==================
* Implemented ``timeout_at(deadline)`` (117)
* Supported ``timeout.deadline`` and ``timeout.expired`` properties.
* Dropped ``timeout.remaining`` property: it can be calculated as
``timeout.deadline - loop.time()``
* Dropped ``timeout.timeout`` property that returns a relative timeout based on the
timeout object creation time; the absolute ``timeout.deadline`` should be used
instead.
* Added the deadline modification methods: ``timeout.reject()``,
``timeout.shift(delay)``, ``timeout.update(deadline)``.
* Deprecated synchronous context manager usage