Cibuildwheel

_20 September 2020_

- 🛠 Add PPC64LE manylinux image supporting Python 3.9. (436)
- 📚 Add project URLs to PyPI listing (428)

_9 September 2020_

- 🌟 Add Python 3.9 support! This initial support uses release candidate
builds. You can start publishing wheels for Python 3.9 now, ahead of
the official release. (382)

Minor note - if you're building PPC64LE wheels, the manylinux image pinned
by this version is
[still on Python 3.9b3](https://github.com/pypa/manylinux/issues/758), not a
release candidate. We'd advise holding off on distributing 3.9 ppc64le wheels
until a subsequent version of cibuildwheel.

- 🌟 Add Gitlab CI support. Gitlab CI can now build Linux wheels, using
cibuildwheel. (419)
- 🐛 Fix a bug that causes pyproject.toml dependencies to fail to install on
Windows (420)
- 📚 Added some information about Windows VC++ runtimes and how they relate
to wheels.

_22 July 2020_

- 🐛 Fix a bug that would cause command substitutions in CIBW_ENVIRONMENT to
produce no output on Linux (411)
- 🐛 Fix regression (introduced in 1.5.3) which caused BEFORE_BUILD and
BEFORE_ALL to be executed in the wrong directory (410)

_19 June 2020_

- 🐛 Fix a bug that would cause command substitutions in CIBW_ENVIRONMENT
variables to not interpret quotes in commands correctly (406, 408)

_19 July 2020_

- 🛠 Update CPython 3.8 to 3.8.3 (405)
- 🛠 Internal refactoring of Linux build, to move control flow into Python (386)

_8 July 2020_

- 🐛 Fix an issue on Windows where pyproject.toml would cause an error when
some requirements formats were used. (401)
- 🛠 Update CPython 3.7 to 3.7.8 (394)