v2.0.0rc5

This version makes auto-reply methods pluggable and supports asynchronous mode in agents. An example of handling data steams is added.
Thanks to @qingyun-wu @ekzhu for laying the foundation and reviewing!

What's Changed

• Make auto reply method pluggable by @sonichi in #1177
• support async in agents by @sonichi in #1178

Full Changelog: v2.0.0rc4...v2.0.0rc5