Made the soundexMapping variable final as it's only ever set once

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@582448 13f79535-47bb-0310-9956-ffa450edef68

Author: hen

src/java/org/apache/commons/codec/language/RefinedSoundex.java

@@ -48,7 +48,7 @@ public class RefinedSoundex implements StringEncoder {
 	 * array holds the values to which each letter is mapped. This
 	 * implementation contains a default map for US_ENGLISH
 	 */
-    private char[] soundexMapping;
+    private final char[] soundexMapping;
 
     /**
 	 * Creates an instance of the RefinedSoundex object using the default US