Log Message:
py-uvloop: updated to 0.12.0

v0.12.0:
New Features
- New SSL implementation. The new implementation is faster and
  and more complete, and will become the default SSL implementation
  in asyncio 3.8. This is a significant change that warrants a release
  candidate to make sure it is tested properly.
- New uvloop.install() helper function.

Bug Fixes
- All bug fixes from 0.11.0—0.11.3 are included in
this release.
- ssl.CertificateError is no longer logged as it's delivered to
the Protocol.connection_lost() anyways.
- Don't use non-existent UDPTransport._address attribute.

Performance
- Improve UDPTransport.sendto() performance.