v0.15.0

Changelog (v0.14.0...v0.15.0)

• feature #2759 Support decision models (@wachterjohannes)
• minor #2753 Bump version constraints to 0.15 (@chr-hertel)
• feature #2686 Move the decision types out of the TypeSafe bridge into a Decision bridge (@wachterjohannes, @chr-hertel)