Change version preparing for release.

Author: jmrozanec

pom.xml

@@ -9,7 +9,7 @@
 
 	<groupId>com.cronutils</groupId>
 	<artifactId>cron-utils</artifactId>
-	<version>3.1.1-SNAPSHOT</version>
+	<version>3.1.1</version>
 
 	<name>cron-utils</name>
 	<description>A Java library to parse, migrate and validate crons as well as describe them in human readable language</description>