chore: update POM version for next release

Author: rdeltour

pom.xml

@@ -11,7 +11,7 @@
 
     <groupId>org.w3c</groupId>
     <artifactId>epubcheck</artifactId>
-    <version>5.2.2-SNAPSHOT</version>
+    <version>5.3.0-SNAPSHOT</version>
 
     <packaging>jar</packaging>