Release 0.4.0

Author: miguelgrinberg

setup.py

@@ -12,7 +12,7 @@
 
 setup(
     name='python-engineio',
-    version='0.3.1',
+    version='0.4.0',
     url='http://github.com/miguelgrinberg/python-engineio/',
     license='MIT',
     author='Miguel Grinberg',