v0.0.19

What's Changed

• Speed benchmark on OpenSpiel and PettingZoo by @nissymori in #394
• Add gif to README by @sotetsuk in #404
• [Backgammon] Implement no-op by @nissymori in #415
• Refactor speed benchmark scripts by @sotetsuk in #409
• [Backgammon] FIx backgammon warning by @sotetsuk in #418

Full Changelog: v0.0.18...v0.0.19