2.0.0-beta

Regarding the major APIs since the 2.0.0-alpha release: Strict Concurrency support has been completed. Additionally, the naming conventions for some classes have been changed.

Notes

• [WIP] Moving from 1.9.x APIs to 2.0.0

What's Changed

• Update README.md by @shogo4405 in #1538

Full Changelog: 2.0.0-alpha...2.0.0-beta