Update to spring-boot 2.0.3.RELEASE

Author: joshiste

pom.xml

@@ -27,7 +27,7 @@
  <url>https://github.com/codecentric/spring-boot-admin/</url>
  <properties>
  <revision>2.0.1-SNAPSHOT</revision>
- <spring-boot.version>2.0.3.BUILD-SNAPSHOT</spring-boot.version>
+ <spring-boot.version>2.0.3.RELEASE</spring-boot.version>
  <spring-cloud.version>Finchley.RC2</spring-cloud.version>
  <hazelcast-tests.version>3.9.4</hazelcast-tests.version>
  <java.version>1.8</java.version>