Update changelog

Updated changelog for version 0.19.1 with changes.

Author: gfrn

CHANGELOG.rst

@@ -7,6 +7,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
++++++++++
+v0.19.1 (16/02/2026)
++++++++++
+
+**Changed** 
+
+- Remove leading zeroes from proposal number passed to shipping service
+- Set name max length to 80 characters
+- More descriptive error messages for attempting to delete referenced samples
+- Update name when dewar code changes
+- Update PDF report text
+
 +++++++++
 v0.19.0 (16/01/2026)
 +++++++++