Log Message:
py-cached-property: updated to 1.4.2

1.4.2:
Really fixed tests

1.4.1:
Added conftest.py to manifest so tests work properly off the tarball
Ensured new asyncio tests didn't break Python 2.7 builds on Debian
Code formatting via black

1.4.0:
Added asyncio support
Remove Python 2.6 support, whose end of life was 5 years ago