fixed findbugs violation: SIC_INNER_SHOULD_BE_STATIC

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/digester/trunk@1142022 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/digester3/RegexRules.java b/src/main/java/org/apache/commons/digester3/RegexRules.java
index 1322b1e..f1e5858 100644
--- a/src/main/java/org/apache/commons/digester3/RegexRules.java
+++ b/src/main/java/org/apache/commons/digester3/RegexRules.java
@@ -143,7 +143,7 @@
     }
 
     /** Used to associate rules with paths in the rules list */
-    private class RegisteredRule
+    private static class RegisteredRule
     {
         String pattern;