We've just published the 0.20.1 maintenance release:
A couple important subflow fixes for issues that didn't get flushed out by the previous beta releases.
- Ensure all subflow instances are stopped when flow stopping Fixes #2095
- modify name of Korean locale folders #2091
- Ensure node names are sanitized before being presented
- Subflow status node must pass status to parent flow Fixes #2087
- fix problem on displaying option label on Firefox #2090