Release 6.0.0.

Change-Id: I2168c4d15dd03379a9c7e53b257be3e5b69b7b3b
diff --git a/core/pom.xml b/core/pom.xml
index 20713c2..cc3b3c4 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -14,7 +14,7 @@
   <parent>
     <groupId>eu.mulk.quarkus-googlecloud-jsonlogging</groupId>
     <artifactId>quarkus-googlecloud-jsonlogging-parent</artifactId>
-    <version>6.0.0-SNAPSHOT</version>
+    <version>6.0.0</version>
   </parent>
 
   <artifactId>quarkus-googlecloud-jsonlogging-core</artifactId>