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

pom.xml

@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>fess</artifactId>
-	<version>14.15.0</version>
+	<version>14.15.1-SNAPSHOT</version>
 	<packaging>war</packaging>
 	<name>Fess</name>
 	<description>Fess is Full tExt Search System.</description>