Corrected typo

setup.py

@@ -4,7 +4,7 @@ from distutils.core import setup
 
 setup(name='twspy',
       version='0.8',
-      description='A standalone implementation of websockets (RFC 6455)',
+      description='A standalone implementation of websockets (RFC 6455).',
       author='Taddeus Kroes',
       author_email='taddeuskroes@gmail.com',
       url='https://github.com/taddeus/twspy',