docs: add changelog for #3249

Author: iBotPeaches

docs/unreleased.mdx

@@ -25,6 +25,7 @@ The changelog of the upcoming release, subject to change prior to finalization.
 - Change build system to ignore missing javadoc blocks. [#3222](https://github.com/iBotPeaches/Apktool/pull/3222) (Thanks sv99)
 - Change `-c/--copy-original` to no longer be deprecated. [#2129](https://github.com/iBotPeaches/Apktool/issues/2129)
 - Change frequency of dummy resources to be less often after proper disassembly of resources. [#2683](https://github.com/iBotPeaches/Apktool/issues/2683), [#2104](https://github.com/iBotPeaches/Apktool/issues/2104)
+- Change build system configuration to Kotlin DSL. [#3249](https://github.com/iBotPeaches/Apktool/pull/3249)
 - Refactor out specific manifest file decoder for empty resource table. [#3171](https://github.com/iBotPeaches/Apktool/pull/3171) (Thanks sv99)
 - Refactor out duo logic with decoders during resource parser. [#3211](https://github.com/iBotPeaches/Apktool/pull/3211) (Thanks sv99)
 - Refactor for specific method operations for loading full resource table. [#3217](https://github.com/iBotPeaches/Apktool/pull/3217) (Thanks sv99)