- Update to version 1.1.3
* CMake exported target, easing inclusion in larger projects
(see demos/CMakeLists.txt for an example)
* Windows no longer uses a single fixed TCP port for eventfd
(this should improve reliability)
* Fix for an assertion failure in efd_unsignal
* The ABI version is separate from the library version now.
* Fixed a crash when calling nn_term without first opening a
socket.
* Fix for building Windows tests on case-sensitive file systems.
* CI/CD improvements: switch to CircleCI, and use CodeCov for
coverage analysis.