Piccolo

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The media endpoints now obey the ``read_only`` option of ``create_admin``.
Read only mode is used for online demos.

Thanks to sinisaos for adding this.

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The user can now specify the primary key column (courtesy aminalaee). For
example:

.. code-block:: python

class RecordingStudio(Table):
pk = UUID(primary_key=True)

The BlackSheep template generated by ``piccolo asgi new`` now supports mounting
of the Piccolo Admin (courtesy sinisaos).

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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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