v1.5.4

• Implement Co::isRunning()

v1.5.3

• Builtin scheduler revived
• New option autoschedule for enabling builtin scheduler

v1.5.2

• Use react/promise instead of mpyw/runtime-promise
• Refactored Deferred-based flows into Promise-based ones
• Non-Runtime Throwables with yield statement can be captured everywhere explicitly using try-catch blocks