Add changelog for PocketIC server v3.0.1 (#10)

Co-authored-by: Michael Weigelt <michael.weigelt@dfinity.com>

CHANGELOG.md

@@ -5,6 +5,13 @@ 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).
 
+## 3.0.1 - 2024-02-14
+
+### Fixed
+- traps in tECDSA calls
+- server rejects jsons containing unimplemented variants of SubnetSpec
+- inspect_message no longer panics when call is rejected
+
 
 ## 3.0.0 - 2024-02-06