chore(changelog): add entry for 747

CHANGELOG.md

@@ -47,6 +47,7 @@ This name should be decided amongst the team before the release.
 ### Added
 - [#785](https://github.com/tweag/topiary/pull/785) Added the `coverage` command, that checks how much of the query file is used by the input.
 - [#786](https://github.com/tweag/topiary/pull/786) Re-introduce tests to check that all of the language queries are useful.
+- [#747](https://github.com/tweag/topiary/pull/747) Added support for specifying paths to prebuilt grammars in Topiary's configuration
 
 ### Changed
 - [#780](https://github.com/tweag/topiary/pull/780) Measuring scopes are now independent from captures order