Update changelog for 1.1.8

CHANGELOG.md

@@ -5,13 +5,18 @@
 ### Added
 
 - **aiken**: Generate a default 'placeholder' validator when using `aiken new`. See [#1061](https://github.com/aiken-lang/aiken/pull/1061) @Waalge
+- **aiken-lang**: New builtins 'constr_fields' and 'constr_index'. @Microproofs
+- **aiken-lang**: New builtins from Chang2 hardfork (except for writeBits). @Microproofs & @KtorZ
+- **uplc**: New builtins from Chang2 hardfork added to the VM along with costing. @Microproofs
+
 
 ### Changed
 
 - **aiken**: Fix `aiken blueprint policy` computing hashes as PlutusV1, instead of relying on the plutus version from the Blueprint. @KtorZ
 - **uplc**: Parse tild in identifiers for UPLC nodes. @SupernaviX
 - **examples**: Update "Hello, World!" source code tutorial to match website, now using MeshJS. @jinglescode
 - **examples**: Update "Gift Card" source code tutorial to match website, now using Lucid-Evolution and Weld. @rvcas
+- **aiken-lang**: Fixed a code gen crash when using records in when is expressions. @Microproofs
 
 ## v1.1.7 - 2024-11-19