Log Message:
Tue Nov  5 17:39:00 EST 2019
  Version 1.21
  * Fix bug in timeout_system that caused it to wait the maximum
    duration on every call.

Sun Nov  3 19:34:00 EST 2019
  Version 1.20

  * More correct parsing of Win32 arguments to determine
    executable name, and more correct quoting when building
    command line when starting from an argv.
  * More correct use of Unix signals during ->die, but also give
    user the ability to specify a custom sequence of signals.
  * Emulate Unix exit status of SIGKILL on Win32 when process was
    ended using $proc->Kill
  * New attributes ->exit_code and ->exit_signal help inspect the
    wstat value returned by ->wait.
  * Fix Win32 path separator used when searching %PATH% for exe
  * Don't leak changes to $? when calling ->die() during DESTROY
  * Make sure all die_upon_destroy happens before global destruction
  * Re-tooled with Dist::Zilla for modern generation of MYMETA and
    automatic version, license, etc.