migrated StringBuffer to StringBuilder

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/digester/trunk@1211783 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/digester3/RecordedInvocation.java b/src/main/java/org/apache/commons/digester3/RecordedInvocation.java
index 53ff646..5569703 100644
--- a/src/main/java/org/apache/commons/digester3/RecordedInvocation.java
+++ b/src/main/java/org/apache/commons/digester3/RecordedInvocation.java
@@ -80,7 +80,7 @@
      */

     public String toString()

     {

-        StringBuffer buffer = new StringBuffer();

+        StringBuilder buffer = new StringBuilder();

         buffer.append( invokedMethod.getDeclaringClass().getName() );

         buffer.append( "." );

         buffer.append( invokedMethod.getName() );

@@ -105,7 +105,7 @@
      * @param buffer the buffer to append the string representation of the input object.

      * @param input the input object has to be serialized to string.

      */

-    protected void convert( StringBuffer buffer, Object input )

+    protected void convert( StringBuilder buffer, Object input )

     {

         if ( input == null )

         {