[maven-release-plugin] prepare for next development iteration

plugins/maven/graphql-java-codegen-maven-plugin/pom.xml

@@ -4,7 +4,7 @@
     <groupId>io.github.kobylynskyi</groupId>
     <artifactId>graphql-codegen-maven-plugin</artifactId>
     <packaging>maven-plugin</packaging>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <name>graphql-codegen-maven-plugin</name>
     <description>Provides a goal for generating Java code based on GraphQL schema</description>