Upgrade to release 20.0.0:
- Update bundled libzmq to 4.3.3
- Socket.bind() and Socket.connect() can now be used as context
managers
- Better error when libzmq is bundled and fails to be loaded
- Hold GIL while calling zmq_curve_ functions, which may fix
apparent threadsafety issues
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Acked-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
