Update CHANGELOG.md for reanalyze PRs #8043 and #8082

Author: cristianoc

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 #### :bug: Bug fix
 
+- Reanalyze: make optional args analysis liveness-aware, preventing false positives when functions are only called from dead code. https://github.com/rescript-lang/rescript/pull/8082
 - Fix exponential compilation blowup with large unboxed variants and dict pattern matching. https://github.com/rescript-lang/rescript/pull/8078
 - Rewatch: warnings for unsupported/unknown `rescript.json` fields. https://github.com/rescript-lang/rescript/pull/8031
 - Fix missing `ignore` function in some Stdlib modules. https://github.com/rescript-lang/rescript/pull/8060
@@ -26,6 +27,10 @@
 
 - Add missing deprecation and migration for `Exn.Error`. https://github.com/rescript-lang/rescript/pull/8036
 
+#### :house: Internal
+
+- Reanalyze: refactor DCE to pure pipeline architecture for order-independence and incremental update support. https://github.com/rescript-lang/rescript/pull/8043
+
 # 12.0.0
 
 No changes compared to rc.5.