Aiorequestful

Added
-----
* Raise an exception on :py:meth:`.RequestHandler.request` when called and the session is closed.

Documentation
-------------
* Expand README to complete all placeholder sections

Changed
-------
* Rename AuthResponseHandler to :py:class:`.AuthResponse`.
Implements MutableMapping to allow handling of response on the object directly.
* Rename AuthResponseTester to :py:class:`.AuthTester`.
:py:meth:`.AuthTester.test` now only requires the :py:class:`.AuthResponse` for input.

Fixed
-----
* Removed bad exception condition on retry timer in :py:class:`.RequestHandler`

Fixed
-----
* Bug when awaiting :py:class:`.Timer.

Changed
-------
* Removed ability to pass response to methods in :py:class:`.AuthResponseHandler`.
Now only the stored response is used always.

Fixed
-----
* Headers not passed to response tester. Now works as expected.

Changed
-------
* :py:class:`.Timer` now supports int and float operations.
* All cache backends no longer rely on JSON based payloads and have been made generic enough
to support all :py:class:`.PayloadHandler` implementations.

Removed
-------
* ``value`` property on :py:class:`.Timer` in favour of using builtin ``int`` and ``float`` calls
to get the timer value.

Documentation
-------
* Add standard info for installing
* Expand and reformat index

Changed
-------
* RequestSettings renamed to :py:class:`.ResponseRepositorySettings`
* :py:meth:`.ResponseRepositorySettings.get_key` now accepts all request kwargs as given by :py:class:`.RequestKwargs`.
In addition, :py:class:`.ResponseRepository` now passes ``method``, ``url``, and ``headers``
to :py:meth:`.ResponseRepositorySettings.get_key`
* ``factor`` renamed to ``exponent`` on power :py:class:`.Timer` implementations
* Renamed serialise method to :py:meth:`.PayloadHandler.deserialize` on :py:class:`.PayloadHandler`

Documentation
-------------
* Expanded docstrings everywhere