LOG: Unreleased changes since last release

CHANGELOG.md

@@ -7,6 +7,17 @@ All substantial or important changes to `shapelets` will be written in this file
 - MNT: General modifications, maintenance (including documentation), or enhancements 
 - NEW: Introduction of a new component or feature
 
+## UNRELEASED
+- NEW: Introduced CHANGELOG.md for detailed version control history 
+- NEW: Introduced `shapelets.core` for essential components (i.e., shapelet functions, entry points)
+- FIX: Corrected characteristic wavelength overestimation ([#64](https://github.com/uw-comphys/shapelets/pull/64))
+- FIX: Corrected optimal filter orientation for steerable shapelets ([#62](https://github.com/uw-comphys/shapelets/pull/62)) 
+- MNT: Several documentation changes, including fixes for pdoc website compilation errors 
+- NEW: Added orthonormal (n=1) polar shapelets, with supporting methods and unit tests 
+- FIX: Fixed entry point bug using incorrect python interpreter from local machine ([#55](https://github.com/uw-comphys/shapelets/pull/55))
+- MNT: Merged setup.cfg and MANIFEST.in into pyproject.toml, which now holds all project specifications
+- MNT: Replaced existing Python response distance with C++ implementation, achieving ~15x speed-up!
+
 ## [1.1] -- 12/04/2024
 - commit cd45ff9174503c44179538af2d83cf2c2444d53a
 - FIX: Fixed issue where unit tests were not available after pip installation ([#45](https://github.com/uw-comphys/shapelets/pull/45))