0.23.1

• JS: Fix dependencies in NPM: add "kotlinx-atomicfu" dependency (see #370).
• Introduce broadcast coroutine builder (see #280):
  • Support BroadcastChannel.cancel method to drop the buffer.
  • Introduce ReceiveChannel.broadcast() extension.
• Fixed a bunch of doc typos (PRs by @paolop).
• Corrected previous version's release notes (PR by @ansman).