Set version to 0.7.5 and update the changelog

CHANGELOG

@@ -2,6 +2,8 @@ This file describes the new features in each poezio release.
 For more detailed changelog, see the roadmap:
 http://dev.louiz.org/project/poezio/roadmap
 
+* Poezio 0.7.5 - dev
+- Plugin system
 
 * Poezio 0.7.2 - 08 Nov 2011
 - Huge speed improvements in both memory usage, text

src/connection.py

@@ -51,7 +51,7 @@ class Connection(sleekxmpp.ClientXMPP):
         self.register_plugin('xep_0085')
         if config.get('send_poezio_info', 'true') == 'true':
             info = {'name':'poezio',
-                    'version':'0.7.2'}
+                    'version':'0.7.5-dev'}
             if config.get('send_os_info', 'true') == 'true':
                 info['os'] = common.get_os_info()
             self.register_plugin('xep_0092', pconfig=info)