Pymssql

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General
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- Publish Linux wheels for the all supported platforms.
manylinux1 wheels are not compatible with modern glibc and OpenSSL.
- Add readthedocs configuration file.

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General
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- Add Python-3.9 to the build and test matrix.
- Drop support for Python2 and Python3 < 3.6.
- Use FreeTDS-1.2.18 for official wheels on PyPi.

Features
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- Support bulk copy (279). Thanks to Simon.StJG (PR-689).
- Wheels on PyPI link FreeTDS statically.
- Wheels on PyPI linked against OpenSSL.
- Convert pymssql to a package. **Potential compatibility issue:** projects using
low level *_mssql* module need to import it from *pymssql* first.

Bug fixes
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- Fixed a deadlock caused by a missing release of GIL (540), thanks to
filip.stefanak (PR-541) and Juraj Bubniak (PR-683).
- Prevents memory leak on login failure. Thanks to caogtaa and Simon.StJG (PR-690).
- Fix check for TDS version (652 and 669).
- Documentation fixes. Thanks to Simon Biggs, Shane Kimble, Simon.StJG and Dale Evans.

Internals
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- Introduce script dev/build.py to build FreeTDS and pymssql wheels.
- Simplify setup.py, introduce environment variables to select FreeTDS includes
and libraries.

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General
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- Revert deprecation

- Support Python-3.8. Update tests for Python-3.8 compatibility.

- Use correct language level for building Cython extension.

- Fix FreeTDS version checks. Add check for version 7.4.

- Use Github Actions for building wheels for Linux, macOS and Windows.

- Drop bundled FreeTDS-0.95 binaries.

- Unless some critical bug is discovered, this will be the last release with Python2
support.

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General
-------

- Drop support for versions of FreeTDS older than 0.91.

- Add Python 3.7 support

- Drop Python 3.3 support

Features
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- Support for new in SQL Server 2008 ``DATE``, ``TIME`` and ``DATETIME2`` data
types (GH-156). The following conditions need to be additionally met so
values of these column types can be returned from the database as their
native corresponding Python data types instead of as strings:

* Underlying FreeTDS must be 0.95 or newer.
* TDS protocol version in use must be 7.3 or newer.

Thanks Ed Avis for the implementation. (GH-331)

Bug fixes
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- Fix ``tds_version`` ``_mssql`` connection property value for TDS version.
7.1 is actually 7.1 and not 8.0.

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- We now publish Linux PEP 513 manylinux wheels on PyPI.
- Windows official binaries: Rollback changes to Windows binaries we had
implemented in pymssql 2.1.2; go back to using:

* A statically linked version of FreeTDS (v0.95.95)
* No SSL support

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.. attention:: Windows users: You need to download and install additional DLLs

pymssql version 2.1.2 includes a change in the official Windows binaries:
FreeTDS isn't statically linked as it happened up to release 2.1.1, as that
FreeTDS copy lacked SSL support.

Please see http://pymssql.org/en/latest/freetds.html#windows for futher
details.

We are trying to find a balance between security and convenience and will
be evaluating the situation for future releases. Your feedback is greatly
welcome.

Features
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- Add ability to set TDS protocol version from pymssql when connecting to SQL