This patch release fixes environment registration and dependencies in the upkie PyPI package.

Added

• envs: Inform user on installing all optional dependencies
• envs: Name environment rate limiters for more readable logging

Changed

• envs: Refactor environment registration function

Fixed

• PyPI: add PyYAML to dependencies as it is needed by upkie.config
• envs: Export register from submodule
• envs: Overlay constructor spine configuration on top of default config