Prepare bugfix release

NEWS.md

@@ -1,9 +1,23 @@
-# cmdstanr 0.8.0.9000
+# cmdstanr 0.8.1.9000
 
 Items for next release go here
 
 # cmdstanr 0.8.0
 
+## Minor changes
+
+* Added `CMDSTANR_USE_RTOOLS` environment variable to force stock RTools on Windows by @andrjohns in #980
+* Automatically initialise model methods when called, add `inc_warmup` argument to `$unconstrain_draws()` by @andrjohns in #985
+
+## Bugfixes
+
+* Fix errors when using pathfinder object as initial values by @avehtari in #984
+* Fix error with `$unconstrain_draws()` returning incorrect assumptions in some cases by @andrjohns in #983
+* Fix spurious errors about missing CmdStan config files by @andrjohns in #981
+* Fix linking error when exposing SUNDIALS/KINSOL functions or model methods by @andrjohns in #977
+
+# cmdstanr 0.8.0
+
 ## Major new features
 
 * Add functionality for passing `CmdStanFit` objects as initial values by @SteveBronder in #937