update changelog

Author: ttngu207

CHANGELOG.md

@@ -3,6 +3,12 @@
 Observes [Semantic Versioning](https://semver.org/spec/v2.0.0.html) standard and
  [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) convention.
 
+## [Unreleased]
+
++ Update - clustering step, update duration for "median_subtraction" step
++ Bugfix - handles single probe recording in "Neuropix-PXI" format
++ Update - safeguard in creating/inserting probe types upon probe activation
+
 ## [0.2.0] - 2022-10-28
 
 + Add - New schema `ephys_report` to compute and store figures from results