Fix start.spring.io link

Author: bclozel

README.adoc

@@ -21,7 +21,7 @@ include::https://raw.githubusercontent.com/spring-guides/getting-started-macros/
 [[scratch]]
 == Starting with Spring Initializr
 
-If you use Maven, visit the https://start.spring.io/#!type=maven-project&language=java&platformVersion=2.4.3.RELEASE&packaging=jar&jvmVersion=1.8&groupId=com.example&artifactId=scheduling-tasks&name=scheduling-tasks&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.scheduling-tasks[Spring Initializr] to generate a new project with the required settings.
+If you use Maven, visit the https://start.spring.io/#!type=maven-project&language=java&platformVersion=2.4.3&packaging=jar&jvmVersion=1.8&groupId=com.example&artifactId=scheduling-tasks&name=scheduling-tasks&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.scheduling-tasks[Spring Initializr] to generate a new project with the required settings.
 
 The following listing shows the `pom.xml` file that is created when you choose Maven:
 
@@ -32,7 +32,7 @@ include::initial/pom.xml[]
 ----
 ====
 
-If you use Gradle, visit the https://start.spring.io/#!type=gradle-project&language=java&platformVersion=2.4.3.RELEASE&packaging=jar&jvmVersion=1.8&groupId=com.example&artifactId=scheduling-tasks&name=scheduling-tasks&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.scheduling-tasks[Spring Initializr] to generate a new project with the required settings.
+If you use Gradle, visit the https://start.spring.io/#!type=gradle-project&language=java&platformVersion=2.4.3&packaging=jar&jvmVersion=1.8&groupId=com.example&artifactId=scheduling-tasks&name=scheduling-tasks&description=Demo%20project%20for%20Spring%20Boot&packageName=com.example.scheduling-tasks[Spring Initializr] to generate a new project with the required settings.
 
 The following listing shows the `build.gradle` file that is created when you choose Gradle: