changed HipchatNotifierConfiguration to be a static class, otherwise application context doesn't start up when hipchat notification is enabled.

Author: semeiser

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/config/NotifierConfiguration.java

@@ -82,7 +82,7 @@ public PagerdutyNotifier pagerdutyNotifier() {
 @Configuration
 @ConditionalOnProperty(prefix = "spring.boot.admin.notify.hipchat", name = "url")
 @AutoConfigureBefore({ NotifierListenerConfiguration.class })
-public class HipchatNotifierConfiguration {
+public static class HipchatNotifierConfiguration {
  @Bean
  @ConditionalOnMissingBean
  @ConditionalOnProperty(prefix = "spring.boot.admin.notify.hipchat", name = "enabled", matchIfMissing = true)