v0.8.1 - Bugfix Release

What's Changed

• Fix linking error when exposing SUNDIALS/KINSOL functions or model methods by @andrjohns in #977
• Add CMDSTANR_USE_RTOOLS envvar to force use of stock RTools by @andrjohns in #980
• Fix spurious cmdstan config errors by @andrjohns in #981
• Fix incorrect sizing for unconstrain_draws() in some cases by @andrjohns in #983
• fix process_init_approx by @avehtari in #984
• Automatically init model methods, add inc_warmup argument to unconstrain_draws() method by @andrjohns in #985
• Update repo links to use r-universe by @andrjohns in #988
• Bugfixes - Fix Windows path change, aarch64 rtools, 2.35 seed changes by @andrjohns in #990
• Prepare v0.8.1 bugfix release by @andrjohns in #989

Full Changelog: v0.8.0...v0.8.1