Log Message:
py-billiard: updated to 3.6.3.0

3.6.1:
- Logging max memory reached at INFO rather than WARNING
- Pass arguments when wrapping sys.exit
- Remove win32/py2k special
- Ensure READY messages sent out by exiting worker are consumed prior to it \ 
actually existing.
- Pass max_memory_per_child to child worker process
- Fix compatibility with Python 2.7 on Windows