Update Python version requirements.

Author: jburhenn

README.rst

@@ -4,7 +4,7 @@ The Cayenne MQTT Python Library provides functions to easily connect to the `Cay
 
 Requirements
 ============
-* `Python 2.7 or 3.x <https://www.python.org/downloads/>`_.
+* `Python 2.7.9+ or 3.4+ <https://www.python.org/downloads/>`_.
 * `This library <https://github.com/myDevicesIoT/Cayenne-MQTT-Python/archive/master.zip>`_.
 * `Eclipse Paho MQTT Python client library <https://github.com/eclipse/paho.mqtt.python>`_. This is installed as part of the Cayenne library installation.
 

setup.py

@@ -17,7 +17,7 @@
                'License :: OSI Approved :: MIT License',
                'Intended Audience :: Developers',
                'Programming Language :: Python :: 2.7',
-               'Programming Language :: Python :: 3',
+               'Programming Language :: Python :: 3.4',
                'Topic :: Software Development',
                'Topic :: Communications',
                'Topic :: Internet',