Use a strategy for Kotlin version resolution

Closes gh-926

initializr-generator-spring/pom.xml

@@ -28,6 +28,11 @@
 			<artifactId>jmustache</artifactId>
 		</dependency>
 
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-autoconfigure</artifactId>
+		</dependency>
+
 		<dependency>
 			<groupId>io.spring.initializr</groupId>
 			<artifactId>initializr-generator</artifactId>