Update version number and description in setup.py.

diff --git a/src/setup.py b/src/setup.py
index 5dd6696..2803e6d 100755
--- a/src/setup.py
+++ b/src/setup.py
@@ -49,8 +49,7 @@
       description='WebSocket extension for Apache HTTP Server.',
       long_description=(
               'mod_pywebsocket is an Apache HTTP Server extension for '
-              'WebSocket (http://tools.ietf.org/html/'
-              'draft-ietf-hybi-thewebsocketprotocol). '
+              'WebSocket (http://tools.ietf.org/html/rfc6455). '
               'See mod_pywebsocket/__init__.py for more detail.'),
       license='See COPYING',
       name=_PACKAGE_NAME,
@@ -58,7 +57,7 @@
       url='http://code.google.com/p/pywebsocket/',
       # See the source of distutils.version, distutils.versionpredicate and
       # distutils.dist to understand how to name version numbers.
-      version='0.7.2',
+      version='0.7.3',
       )