Cachetools

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- Fix `MANIFEST.in`.

===================

- Deprecate ``TTLCache.ExpiredError``.

- Add `choice` argument to ``RRCache`` constructor.

- Refactor ``LFUCache``, ``LRUCache`` and ``TTLCache``.

- Use custom ``NullContext`` implementation for unsynchronized
function decorators.

===================

- Raise ``TTLCache.ExpiredError`` for expired ``TTLCache`` items.

- Support unsynchronized function decorators.

- Allow ``cachedmethod.cache()`` to return None

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- No formatting of ``KeyError`` arguments.

- Update ``README.rst``.

===================

- Do not delete expired items in TTLCache.__getitem__().

- Add ``ttl_cache`` function decorator.

- Fix public ``getsizeof()`` usage.

===================

- Add ``TTLCache``.

- Add ``Cache`` base class.

- Remove ``cachedmethod`` `lock` parameter.