Credit PR #776 and author in CHANGES.md

Author: fru1tworld

CHANGES.md

@@ -271,9 +271,10 @@ To be released.
     dependency installation after scaffolding.  This is useful for CI
     environments, monorepo workspaces that install dependencies from the
     root, or when you want to inspect the generated files before
-    installing.  [[#720]]
+    installing.  [[#720], [#776] by fru1tworld]
 
 [#720]: https://github.com/fedify-dev/fedify/issues/720
+[#776]: https://github.com/fedify-dev/fedify/pull/776
 
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