update CHANGELOG.rst

CHANGELOG.rst

@@ -5,6 +5,15 @@ 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>`_.
 
+5.6.0 - 2024-02
+----------------
+
+- Reduce 3 alternative implementations to get ISIs into 1.
+- "all_ISI_values" is recommended, "ISI_values" and "ISIs" are deprecated.
+- The features depending on "ISI_values" are moved to Python and now they depend on "all_ISI_values".
+- BUGFIX: single_burst_ratio, irregularity_index, burst_mean_freq, interburst_voltage features were ignoring the first two ISIs when the ignore_first_ISI was set.
+- Added new feature: inv_ISI_values that computes and returns all of the inverse isi values.
+
 5.5.5 - 2024-01
 ----------------
 - Type annotate api.py's functions.