Log Message:
PycURL 7.43.0:

Highlights of this release:

1. Binary wheels are now built for Windows systems.

2. setopt_string method added to Curl objects to permit setting string libcurl
   options that PycURL does not know about.

3. curl module can now be imported on Windows again.

4. OPENSOCKETFUNCTION callback is now invoked with the address as bytes on
   Python 3 as was documented.

5. Support for many libcurl options and constants was added.