replace StringBuffer by StringBuilder

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1384337 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/plugin/toolchain/ToolchainMojo.java b/src/main/java/org/apache/maven/plugin/toolchain/ToolchainMojo.java
index dc2ecfe..57f1746 100644
--- a/src/main/java/org/apache/maven/plugin/toolchain/ToolchainMojo.java
+++ b/src/main/java/org/apache/maven/plugin/toolchain/ToolchainMojo.java
@@ -106,7 +106,7 @@
             if ( !nonMatchedTypes.isEmpty() )
             {
                 //TODO add the default toolchain instance if defined??
-                StringBuffer buff = new StringBuffer();
+                StringBuilder buff = new StringBuilder();
                 buff.append( "Cannot find matching toolchain definitions for the following toolchain types:" );
                 Iterator it = nonMatchedTypes.iterator();
                 while ( it.hasNext() )