use StringBuilder rather than StringBuffer

git-svn-id: https://svn.apache.org/repos/asf/archiva/redback/redback-components/trunk@1370986 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/archiva/redback/components/evaluator/DefaultExpressionEvaluator.java b/src/main/java/org/apache/archiva/redback/components/evaluator/DefaultExpressionEvaluator.java
index c2242bf..4bf8ae2 100644
--- a/src/main/java/org/apache/archiva/redback/components/evaluator/DefaultExpressionEvaluator.java
+++ b/src/main/java/org/apache/archiva/redback/components/evaluator/DefaultExpressionEvaluator.java
@@ -79,7 +79,7 @@
         int offset = 0;
         String expression;
         String value;
-        StringBuffer expanded = new StringBuffer();
+        StringBuilder expanded = new StringBuilder();
 
         while ( mat.find( offset ) )
         {