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

Author: kmozsi

pom.xml

@@ -4,7 +4,7 @@
     <artifactId>convertapi</artifactId>
     <packaging>jar</packaging>
 
-    <version>2.11-SNAPSHOT</version>
+    <version>2.12-SNAPSHOT</version>
     <name>ConvertAPI Java Client</name>
     <description>
         The ConvertAPI helps converting various file formats.