message: Add release date to changelog.
diff: @@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  ## [Unreleased]
  -## [0.3.4]
  +## [0.3.4] - 2021-01-24
  ### Added
  - Added support for benchmarking async functions
  - Added `with_output_color` for enabling or disabling CLI output coloring programmatically.
  