Add missing @SInCE tag

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/cli/trunk@1677407 13f79535-47bb-0310-9956-ffa450edef68

Author: britter

src/main/java/org/apache/commons/cli/HelpFormatter.java

@@ -92,7 +92,11 @@ public class HelpFormatter
     /** default prefix for long Option */
     public static final String DEFAULT_LONG_OPT_PREFIX = "--";
 
-    /** default separator displayed between a long Option and its value */
+    /** 
+     * default separator displayed between a long Option and its value
+     * 
+     * @since 1.3
+     **/
     public static final String DEFAULT_LONG_OPT_SEPARATOR = " ";
 
     /** default name for an argument */