update changelog.md

Author: JaerongA

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.
 
+## [0.2.2] - Unreleased
+
++ Update & fix docstrings
++ `UnitLevelReport` depends on `ClusterQualityLabel`
++ Add `.pre-commit-config.yaml`
+
 ## [0.2.1] - Unreleased
 
 + Update - clustering step, update duration for "median_subtraction" step
@@ -38,7 +44,7 @@ Observes [Semantic Versioning](https://semver.org/spec/v2.0.0.html) standard and
 
 + Update - Rename module for acute probe insertions from `ephys.py` to `ephys_acute.py`.
 + Add - Module for pre-clustering steps (`ephys_precluster.py`), which is built off of `ephys_acute.py`.
-+ Add - Module for chronic probe insertions (`ephys_chronic.py`).  
++ Add - Module for chronic probe insertions (`ephys_chronic.py`).
 + Bugfix - Missing `fileTimeSecs` key in SpikeGLX meta file.
 + Update - Move common functions to `element-interface` package.
 + Add - NWB export function
@@ -60,6 +66,7 @@ Observes [Semantic Versioning](https://semver.org/spec/v2.0.0.html) standard and
 + Add - Probe table supporting: Neuropixels probes 1.0 - 3A, 1.0 - 3B, 2.0 - SS,
   2.0 - MS
 
+[0.2.2]: https://github.com/datajoint/element-array-ephys/releases/tag/0.2.2
 [0.2.1]: https://github.com/datajoint/element-array-ephys/releases/tag/0.2.1
 [0.2.0]: https://github.com/datajoint/element-array-ephys/releases/tag/0.2.0
 [0.1.4]: https://github.com/datajoint/element-array-ephys/releases/tag/0.1.4