Update changelog

Author: adamwathan

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Nothing yet!
+
+## [1.8.5] - 2020-09-07
+
+### Fixed
+
 - Fix issue where `resolveConfig` didn't take into account configs added by feature flags ([#2347](https://github.com/tailwindlabs/tailwindcss/pull/2347))
 
 ## [1.8.4] - 2020-09-06