Merge pull request #4608 from jadekler/batch_config_public

* pr/4608:
  BasicBatchConfigurer is public again

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/BasicBatchConfigurer.java

@@ -43,7 +43,7 @@ import org.springframework.util.StringUtils;
  * @author Andy Wilkinson
  */
 @Component
-class BasicBatchConfigurer implements BatchConfigurer {
+public class BasicBatchConfigurer implements BatchConfigurer {
 
 	private static Log logger = LogFactory.getLog(BasicBatchConfigurer.class);