Update CHANGELOG.md

CHANGELOG.md

@@ -18,6 +18,7 @@ This website is built from the `HEAD` of the `main` branch of the theme reposito
 Changes to `main` that are *not* in the latest pre-release:
 
 - Added: styling for `<blockquote>` by [@mattxwang] in [#965]
+- Addded: custom include for TOC heading by [@pdmosses] in [#980]
 - Fixed: spacing issue when search is disabled by [@henryiii] in [#960]
 - Fixed: active grandchild link class by [@pdmosses] in [#962]
 - Fixed: HTML validation issues (W3C validator) by [@mattxwang] in [#964]
@@ -28,6 +29,7 @@ Changes to `main` that are *not* in the latest pre-release:
 [#962]: https://github.com/just-the-docs/just-the-docs/pull/962
 [#964]: https://github.com/just-the-docs/just-the-docs/pull/964
 [#967]: https://github.com/just-the-docs/just-the-docs/pull/967
+[#980]: https://github.com/just-the-docs/just-the-docs/pull/980
 
 [@henryiii]: https://github.com/henryiii