fix lint

Author: vkarpov15

test/schema.union.test.js

@@ -61,7 +61,7 @@ describe('Union', function() {
     await assert.rejects(
       doc1.save(),
       'ValidationError: test: Cast to Boolean failed for value "taco tuesday" (type string) at path "test" because of "CastError"'
-    )
+    );
   });
 
   it('should cast for query', async function() {