turtlebot_simulator: 2.1.0-0 in 'hydro/release.yaml' [bloom]

Increasing version of package(s) in repository `turtlebot_simulator`:
- previous version: `2.0.0-2`
- new version: `2.1.0-0`
- distro file: `hydro/release.yaml`
- bloom version: `0.4.4`