Bump version to 3.0.0

Author: morpheus-87

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>de.digitalcollections</groupId>
   <artifactId>iiif-server-demo</artifactId>
-  <version>3.0.0-SNAPSHOT</version>
+  <version>3.0.0</version>
   <packaging>jar</packaging>
 
   <name>DigitalCollections: IIIF Server Demo</name>