Update clirr plugin version. Drop comparison version - it will compare against the latest release by default

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@1671901 13f79535-47bb-0310-9956-ffa450edef68

Author: britter

pom.xml

@@ -260,9 +260,9 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>clirr-maven-plugin</artifactId>
-        <version>2.5</version>
+        <version>2.6.1</version>
         <configuration>
-          <comparisonVersion>1.2</comparisonVersion>
+          <minSeverity>info</minSeverity>
         </configuration>
       </plugin>
       <plugin>