message: Remove wrong prerequisites
diff: <name>JHipster Registry</name>
  <description>JHipster service registry, made with Netflix Eureka and Spring Cloud Config</description>
  - <prerequisites>
  - <maven>${maven.version}</maven>
  - </prerequisites>
  -
  <properties>
  <argLine>-Djava.security.egd=file:/dev/./urandom -Xmx256m</argLine>
  <assertj.version>3.6.2</assertj.version>
  