bump version to 3.1.0

Signed-off-by: Olivier Lamy <olamy@apache.org>

Author: olamy

pom.xml

@@ -8,7 +8,7 @@
  </parent>
 
  <artifactId>exec-maven-plugin</artifactId>
- <version>3.0.1-SNAPSHOT</version>
+ <version>3.1.0-SNAPSHOT</version>
  <packaging>maven-plugin</packaging>
 
  <name>Exec Maven Plugin</name>