interface@v4.0.0

What's new

• Release by @github-actions[bot]
• Convert warmup/cooldown rates to integers (#152) by @grod220
• Update for added "events" (#371) by @joncinque
• Support wincode serialization (#348) by @kskalski
• Remove SysvarSerialize trait dependency (#343) by @grod220
• Bump to v3.1 (#315) by @2501babe