update changelog and contributors

CHANGELOG.md

@@ -5,6 +5,12 @@ 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
+
+### Fixed
+
+- Made type annotations consistent for various `total` keyword arguments in `rich.progress` and rich.`progress_bar`
+
 ## [9.13.0] - 2021-03-06
 
 ### Added

CONTRIBUTORS.md

@@ -10,3 +10,4 @@ The following people have contributed to the development of Rich:
 - [Alexander Mancevice](https://github.com/amancevice)
 - [Will McGugan](https://github.com/willmcgugan)
 - [Nathan Page](https://github.com/nathanrpage97)
+- [Clément Robert](https://github.com/neutrinoceros)