v1.12.0

• Crystal 1.21.0 support 🎉
• Add sse helper for Server-Sent Events #755. Thanks @sdogruyol 🙏

sse "/events" do |stream, env|
  stream.send("tick", event: "tick", id: 1)
end

• Fix unhandled exception when headers were already sent to the client #760. Thanks @sdogruyol 🙏
• Fix before_all filters running twice #758. Thanks @sdogruyol 🙏
• Show actual defaults in --help when host/port are overridden #751. Thanks @Singond 🙏
• Simplify helpers with version controls #752. Thanks @sdogruyol 🙏
• Raise minimum Crystal version to >= 1.12.0
• Fix MySQL example placeholder syntax #756. Thanks @drum445 🙏