Changes for version 1.14 - 2019-02-28 (TRIAL RELEASE)
The ZMQ::FFI::Constants generation script wasn't using stable releases tagged in the libzmq main repo, this is fixed
FFI::TinyCC is no longer an author dep and has been replaced by a docker based solution for generating ZMQ::FFI::Constants, including calculating zmq_msg_t sizes
Fix potential memleak around socket cleanup (GH#33 - thanks @rhrhunter!)
Use string literals for matching option types (GH#30 - thanks @bbkr)