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

pom.xml

@@ -2,7 +2,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.github.ombre42</groupId>
 	<artifactId>jrobotremoteserver</artifactId>
-	<version>3.0</version>
+	<version>3.1-SNAPSHOT</version>
 	<packaging>jar</packaging>
 	<name>jrobotremoteserver</name>
 	<url>https://github.com/ombre42/jrobotremoteserver</url>