Add a changelog file

CHANGELOG.md

@@ -0,0 +1,14 @@
+# Changelog
+
+## [0.4.0] - 2024-12-23
+
+* Introduced a [two pass](README.md#two-pass-mode) mode that will make a second pass over the DOM rewiring elements
+  that were removed but have stable IDs back into the DOM
+  * Uses the new `moveBefore()` API if it is available
+* Firmed up the implementation of softMatching to not soft match when elements have conflicting ids, which should allow
+  developers to avoid accidentally sliding behavior between noded
+* Fixed up the `package.json` file to properly show the esm file as the module
+* Main contributors to this release were @botandrose & @3AMichaelWest22, thank you!
+
+Sorry, I didn't keep track of earlier changes!
+