docs: update release notes

Author: nkrusch

guide/09-release-notes.md

@@ -3,6 +3,12 @@
 
 **Changes to build**
 
+- Custom folders for scss bundles and always minify css [PR #47](https://github.com/MobileFirstLLC/extension-cli/pull/47)
+
+### 1.0.0 (2021-04-11)
+
+**Changes to build**
+
 - automatically copy from `assets/` to output directory `assets/` [PR #43](https://github.com/MobileFirstLLC/extension-cli/pull/43)
 - add target platform for manifests: `chrome/firefox` [PR #43](https://github.com/MobileFirstLLC/extension-cli/pull/43)
 - improved build outputs [PR #42](https://github.com/MobileFirstLLC/extension-cli/pull/42)