pre release update

Author: Leah Wasser

CHANGELOG.md

@@ -5,7 +5,7 @@ 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]
+## [0.1.1]
 * Added test for bin heights of histograms (@ryla5068, #124)
 * Added support for overlapping histograms in histogram tests (@ryla5068, #123)