docs: added changelog

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

CHANGELOG.md

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+# CHANGELOG
+
+
+## 2.2.0 (2024-11-17)
+
+First public release (incompatible with unreleased 1.x version)
+
+* Added CLAP and VST3 formats.
+* Added peak EQ after input.
+* Removed wet signal high-pass filter.
+* Set minimum value for modulation amount param to 0.001.
+* Reduced resolution of LFO frequency param to 1/100 Hz.
+* Improved some parameter labels and changed their names and symbols.
+* Added six factory preset (for guitar).
+* Updated dpf submodule.
+* Updated and extended license file.
+* Updated readme and added screenshot.
+
+
+## 1.2.0 (2024-01-07)
+
+Initial (unreleased) version