[CHANGES]

• Bumped up to three-digit minor version number
  
• Added IO::Async::OS->signum2name
  
• Implement Future::IO->waitpid API
  
• Skip the spawn Routine model if POSIX fork() is not available
  
• Replace getaddrinfo / getnameinfo with virtual mocking functions
  for unit-testing the resolve, so as not to rely on local platform
  resolver behaviours