Update version numbers for Commons IO release 2.6

Author: britter

pom.xml

@@ -24,7 +24,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>commons-io</groupId>
   <artifactId>commons-io</artifactId>
-  <version>2.6-SNAPSHOT</version>
+  <version>2.6</version>
   <name>Apache Commons IO</name>
 
   <inceptionYear>2002</inceptionYear>
@@ -52,6 +52,7 @@ file comparators, endian transformation classes, and much more.
     <connection>scm:git:http://git-wip-us.apache.org/repos/asf/commons-io.git</connection>
     <developerConnection>scm:git:https://git-wip-us.apache.org/repos/asf/commons-io.git</developerConnection>
     <url>https://git-wip-us.apache.org/repos/asf?p=commons-io.git</url>
+    <tag>commons-io-2.6</tag>
   </scm>
 
   <developers>