Upgrade plugin from spring-boot to o.s.boot

complete/build.gradle

 apply plugin: 'java'
 apply plugin: 'eclipse'
 apply plugin: 'idea'
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 
 jar {
     baseName = 'gs-spring-boot'

initial/build.gradle

 apply plugin: 'java'
 apply plugin: 'eclipse'
 apply plugin: 'idea'
-apply plugin: 'spring-boot'
+apply plugin: 'org.springframework.boot'
 
 jar {
     baseName = 'gs-spring-boot'