chore: checkpoint before Python removal

vendor/assert-json-diff/tests/version-numbers.rs

@@ -0,0 +1,12 @@
+#[macro_use]
+extern crate version_sync;
+
+#[test]
+fn test_readme_deps() {
+    assert_markdown_deps_updated!("README.md");
+}
+
+#[test]
+fn test_html_root_url() {
+    assert_html_root_url_updated!("src/lib.rs");
+}