Bump ipytree from 0.1.3 to 0.2.1 (#744)
Bump ipytree from 0.1.3 to 0.2.1 (#744)

Bumps [ipytree](https://github.com/martinRenou/ipytree) from 0.1.3 to 0.2.1.
- [Release notes](https://github.com/martinRenou/ipytree/releases)
- [Changelog](https://github.com/martinRenou/ipytree/blob/master/RELEASE.md)
- [Commits](https://github.com/martinRenou/ipytree/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
zarr-developers/zarr-python