v2.2.0

BridgeStan 2.2.0

What's Changed

• Update preferred citation to point to JOSS by @WardBrian in #162
• Remove unnecessary backward pass in log_density by @WardBrian in #165
• Update to Stan 2.33 by @WardBrian in #167
• Feature: Hessian-vector product function by @WardBrian in #126
• Update bindgen requirement from 0.66.1 to 0.68.1 in /rust by @dependabot in #170
• Update CI and Makefile by @WardBrian in #171

Full Changelog: v2.1.2...v2.2.0