Releasing 0.6.0

[bollwyvl]

• [x] bump versions
• [x] update docs
  • [ ] screenshot
  • [x] badges
  • [x] changelog
• [x] merge to master
• [x] validate
  • [x] binder
  • [x] RTD
• [x] tag
• [x] upload CI-built assets
  • [x] pypi
  • [x] npm
• [ ] postmortem
  • [ ] bump version
  • [ ] validate on binder
  • [ ] update demo branch
  • [x] merge conda-forge PR
  • [ ] update CONTRIBUTING with lessons learned

[bollwyvl]

Have hit a snag with the old, lose focus every time you press a key in an input. thanks react...

[bollwyvl]

Probably going to explore some of the observed issues on #46...