Update release notes

git-svn-id: https://svn.apache.org/repos/asf/james/mime4j/branches/apache-mime4j-0.6@1053150 13f79535-47bb-0310-9956-ffa450edef68

RELEASE_NOTES.txt

@@ -1,9 +1,17 @@
-Release 0.6
--------------------
-
 Mime4J is a flexible MIME parsing library written in Java. SAX, DOM and pull parsing styles are 
 supported.
 
+Release 0.6.1
+-------------------
+This is a bugfix release which include the fix for :
+
+ * DecoderUtil.decodeEncodedWords() fails if encoded-text starts with an equals sign
+   [https://issues.apache.org/jira/browse/MIME4J-138]
+
+
+Release 0.6
+-------------------
+
 The 0.6 release brings another round of API enhancements and performance optimizations. There has 
 been a number of notable improvements in the DOM support. MIME stream parser is expected to be
 50% faster when line counting is disabled. Please also note that as of this release Mime4j