Piccolo

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Added aggregations functions, such as ``Sum``, ``Min``, ``Max`` and ``Avg``,
for use in select queries (courtesy sinisaos).

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Added uvloop as an optional dependency, installed via `pip install piccolo[uvloop]`
(courtesy aminalaee). uvloop is a faster implementation of the asyncio event
loop found in Python's standard library. When uvloop is installed, Piccolo will
use it to increase the performance of the Piccolo CLI, and web servers such as
Uvicorn will use it to increase the performance of your ASGI app.

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Modified the release process, so it works on GitHub (courtesy olliglorioso).

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Added ``eq`` and ``ne`` methods to the ``Boolean`` column, which can be used
if linters complain about using ``SomeTable.some_column == True``.

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* Changed the migration IDs, so the timestamp now includes microseconds. This
is to make clashing migration IDs much less likely.
* Added a lot of end-to-end tests for migrations, which revealed some bugs
in ``Column`` defaults.

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A bug fix for migrations. See `issue 123 <https://github.com/piccolo-orm/piccolo/issues/123>`_
for more information.

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