v0.6.0

What's Changed

• Add support for derivatives, helps for spring steppers by @mbrea-c in #11
• Initialize spring stepper with initial velocity by @mbrea-c in #12
• Update to bevy 0.15 by @mbrea-c in #14
  • Remove custom curve types, since Bevy now has a built-in Curve abstraction

Full Changelog: v0.5.1...v0.6.0