[skip ci] prepare for next development iteration

Author: github-actions[bot]

pom.xml

@@ -4,14 +4,14 @@
 	<groupId>com.danubetech</groupId>
 	<artifactId>verifiable-credentials-java</artifactId>
 	<packaging>jar</packaging>
-	<version>1.19.0</version>
+	<version>1.20-SNAPSHOT</version>
 	<name>verifiable-credentials-java</name>
 
 	<scm>
 		<url>https://github.com/danubetech/verifiable-credentials-java</url>
 		<connection>scm:git:https://github.com/danubetech/verifiable-credentials-java.git</connection>
 		<developerConnection>scm:git:https://github.com/danubetech/verifiable-credentials-java.git</developerConnection>
-		<tag>1.19.0</tag>
+		<tag>HEAD</tag>
 	</scm>
 
 	<issueManagement>