📝 Add deprecation message on test module

Author: lambdalisue

denops_std/test/mod.ts

@@ -1,3 +1,8 @@
-// Re-export
+/**
+ * This module is deprecated. Use https://deno.land/x/denops_test/mod.ts instead.
+ *
+ * @deprecated
+ * @module
+ */
 export { test } from "https://deno.land/x/denops_core@v3.3.0/test/mod.ts";
 export type { TestDefinition } from "https://deno.land/x/denops_core@v3.3.0/test/mod.ts";