Mention new-running tests/benchs in the changelog

cabal-install/changelog

@@ -7,6 +7,8 @@
 	* Completed the 'new-run' command (#4477). The functionality is the
 	same of the old 'run' command but using nix-style builds.
 	Additionally, it can run executables across packages in a project.
+	Tests and benchmarks are also treated as executables, providing a
+	quick way to pass them arguments.
 	* Completed the 'new-bench' command (#3638). Same as above.
 	* Completed the 'new-exec' command (#3638). Same as above.
 	* Added a preliminary 'new-install' command (#4558, nonlocal exes