Update changelog

Author: saulshanabrook

docs/changelog.md

@@ -6,6 +6,10 @@ _This project uses semantic versioning_
 
 - Adds ability to use anonymous functions where callables are needed. These are automatically transformed to egglog
   functions with default rewrites.
+- Upgrade [egglog](https://github.com/egraphs-good/egglog/compare/fb4a9f114f9bb93154d6eff0dbab079b5cb4ebb6...saulshanabrook:egg-smol:a555b2f5e82c684442775cc1a5da94b71930113c)
+  - Adds source annotations to expressions for tracebacks
+  - Adds ability to inline other functions besides primitives in serialized output
+- Adds `remove` and `set` methods to `Vec`
 
 ## 7.2.0 (2024-05-23)