private field unchanged after construction, so might as well be final

git-svn-id: https://svn.apache.org/repos/asf/commons/sandbox/csv/trunk@1298225 13f79535-47bb-0310-9956-ffa450edef68

Author: sebbASF

src/main/java/org/apache/commons/csv/UnicodeUnescapeReader.java

@@ -29,7 +29,7 @@
  * @version $Revision$, $Date$
  */
 class UnicodeUnescapeReader extends Reader {
-    private PushbackReader reader;
+    private final PushbackReader reader;
 
     /** The buffer used to read unicode escape sequences. */
     private final char[] sequence = new char[5];