Merge pull request #458 from rstudio/prepare-1.19.1

Marks changelog with 1.19.1 release.

Author: tdstein

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## [1.19.1] - 2023-08-01
 
 ### Added
 - Failed deploys to shinyapps.io will now output build logs. Posit Cloud application deploys will also output build logs once supported server-side.