Fixing the @SInCE to be 1.3.1 for the static readFileToString(File)

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/io/trunk@507684 13f79535-47bb-0310-9956-ffa450edef68

Author: hen

src/java/org/apache/commons/io/FileUtils.java

@@ -973,7 +973,7 @@ public static String readFileToString(File file, String encoding) throws IOExcep
      * @param file  the file to read, must not be <code>null</code>
      * @return the file contents, never <code>null</code>
      * @throws IOException in case of an I/O error
-     * @since Commons IO 1.3
+     * @since Commons IO 1.3.1
      */
     public static String readFileToString(File file) throws IOException {
         return readFileToString(file, null);