Update changelog

CHANGELOG.md

@@ -3,10 +3,19 @@
 ### Unreleased
 
 * Add `text` as a synonym for `string` (e.g. `5 to text`)
+* Add units `gf` (gram-force), `pond` and variations thereof
+* Add `at` unit (technical atmosphere, equivalent to `kgf/cm^2`)
+* Add `Torr` unit (equivalent to 101325/760 Pascals)
+* Add `kat`/`katal` unit of catalytic activity
+* Add `r`/`q`/`R`/`Q` prefixes for `ronto`, `quecto`, `ronna` and `quetta`
+    respectively
 * Add variants like `sqcm`, `cm2`, `cbcm` and `cm3` for common length units
 * Add `Cmd`+`k` / `Ctrl`+`k` or `Ctrl`+`l` to clear the web UI output
 * Fix multiline input not being visible in the web UI
 * Persist command history in the browser's local storage when using the web UI
+* Change default exchange rate source to the European Central Bank as their
+    API is more reliable.
+* Fix `quetta` prefix (equivalent to 10^30)
 
 ### v1.5.3 (2024-10-06)