Version 1.2.1

Add Go function to call function asynchronously.

Version 1.2.0

• Add waiter support.
• Add broadcaster support.
• Remove http server task.

Version 1.1.1

• Fix typos.
• Fix that the unit test case failed under Go1.14 and Go1.13.

Version 1.1.0

• Add http server task support.

Version 1.0.0

First release.