Update CHANGELOG.md

CHANGELOG.md

@@ -21,6 +21,7 @@ This website includes docs for some new features that are not available in `v0.4
 Changes to `main` that are *not* in the latest pre-release:
 
 - Added: includes for custom `lunr` Liquid and JS code by [@diablodale] in [#1068]
+- Added: new `_sass/custom/setup.scss` for variable definition by [@mattxwang] in [#1135]
 - Fixed: incorrect `padding` property value pair in `search.scss` by [@kevinlin1] in [#1123]
 - Fixed: minor spacing and comment nits by [@EricFromCanada] in [#1128]
 - Docs: update `README` demo video by [@codewithfan] in [#1097]
@@ -33,6 +34,7 @@ Changes to `main` that are *not* in the latest pre-release:
 [#1123]: https://github.com/just-the-docs/just-the-docs/pull/1123
 [#1128]: https://github.com/just-the-docs/just-the-docs/pull/1128
 [#1130]: https://github.com/just-the-docs/just-the-docs/pull/1130
+[#1135]: https://github.com/just-the-docs/just-the-docs/pull/1135
 
 [@agabrys]: https://github.com/agabrys
 [@codewithfan]: https://github.com/codewithfan