prepare 0.4 release

ChangeLog

+python-nbxmpp 0.4 (15 March 2014)
+
+  * Ability to configure TLS protocol version
+  * Add support for SCRAM-SHA-1-PLUS
+  * Security improvements
+
 python-nbxmpp 0.3 (23 December 2013)
 
   * Improve security level

setup.py

@@ -3,7 +3,7 @@
 from distutils.core import setup
 
 setup(name='nbxmpp',
-      version='0.3',
+      version='0.4',
       description='Non blocking Jabber/XMPP module',
       author='Yann Leboulanger',
       author_email='asterix@lagaule.org',