Add blog post url

Author: pkainulainen

spring/README.md

@@ -4,6 +4,7 @@ This blog post is the example application of the following blog posts:
 * [Spring Batch Tutorial: Getting the Required Dependencies With Gradle](http://www.petrikainulainen.net/programming/spring-framework/spring-batch-tutorial-getting-the-required-dependencies-with-gradle/)
 * [Spring Batch Tutorial: Reading Information From a File](http://www.petrikainulainen.net/programming/spring-framework/spring-batch-tutorial-reading-information-from-a-file/)
 * [Spring Batch Tutorial: Creating a Custom ItemReader](http://www.petrikainulainen.net/programming/spring-framework/spring-batch-tutorial-creating-a-custom-itemreader/)
+* [Spring Batch Tutorial: Reading Information From a REST API](http://www.petrikainulainen.net/programming/spring-framework/spring-batch-tutorial-reading-information-from-a-rest-api/)
 
 Prerequisites
 =============