v0.6.0

Bump version to 0.6.0 and update changelog (#80)

I know the date'll be wrong on the changelog (since I have no control
over when the release gets tagged). I figured it shouldn't be a big
deal.

0.5.2

https://pypi.org/project/pyCEC/

0.5.1

Fixed

• Fixed a TypeError exception when using the pyCEC server.

0.5.0

Added

• Added a changelog.
• Added Python 3.8 testing.

Changed

• Updated PyPi classifiers.
• Updated asyncio syntax to use await and async def.

Removed

• Drop Python 3.4 support (EOL).

Fixed

• Allow TcpAdapter to recover from a lost connection.
• Added a missing await for an asyncio.sleep.
• Fixed long_description field for PyPi releases, the README will now render.