Fix error suppression for failed gherkin step

Author: ktryniszewski-mdsol

lib/interfaces/gherkin.js

@@ -53,7 +53,7 @@ module.exports = (text) => {
       } catch (err) {
         step.status = 'failed';
         step.err = err;
-        return err;
+        throw err;
       } finally {
         step.endTime = Date.now();
         event.dispatcher.removeListener(event.step.before, setMetaStep);