Sqlparams

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- Drop support for EOL Python 3.5.
- `Issue 10`_: When converting to 'format'/'pyformat' types, escape existing '%' characters.
- When converting from 'format'/'pyformat' types, set `escape_char=True` to unescape double '%' characters.

.. _`Issue 10`: https://github.com/cpburnz/python-sqlparams/issues/10

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- Major changes to internal implementation.
- Support converting any parameter style to any parameter style (all named,
numeric, and ordinal styles).
- Renamed attribute `named` to `in_style` on `sqlparams.SQLParams`.
- Renamed attribute `ordinal` to `out_style` on `sqlparams.SQLParams`.
- Removed attributes `match` and `replace` from `sqlparams.SQLParams` which
should have been private.
- Named parameters must now be valid identifiers (can no longer start with a
digit to help prevent incorrectly matching common strings such as
datetimes). Fixes `Issue 4`_.
- `Issue 7`_: Support dollar sign style for numeric and named parameters.

.. _`Issue 4`: https://github.com/cpburnz/python-sqlparams/issues/4
.. _`Issue 7`: https://github.com/cpburnz/python-sqlparams/issues/7

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- Drop support for EOL Python 2.7, 3.2, 3.3, 3.4.

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- Require setuptools.
- Support up to Python 3.8.

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- Improved support for byte strings.

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- Fixed support for byte strings.