Update changelog

Author: brianc

CHANGELOG.md

@@ -4,6 +4,13 @@ For richer information consult the commit log on github with referenced pull req
 
 We do not include break-fix version release in this file.
 
+### pg@8.6.0
+
+- Better [SASL](https://github.com/brianc/node-postgres/pull/2436) error messages & more validation on bad configuration.
+- Export [DatabaseError](https://github.com/brianc/node-postgres/pull/2445).
+- Add [ParameterDescription](https://github.com/brianc/node-postgres/pull/2464) support to protocol parsing.
+- Fix typescript [typedefs](https://github.com/brianc/node-postgres/pull/2490) with `--isolatedModules`.
+
 ### pg-query-stream@4.0.0
 
 - Library has been [converted](https://github.com/brianc/node-postgres/pull/2376) to Typescript. The behavior is identical, but there could be subtle breaking changes due to class names changing or other small inconsistencies introduced by the conversion.