Update version.

Change log:
- New type Voice
- Update audio
- sendAduio
- sendVoice
checkout: https://core.telegram.org/bots/api-changelog 20150815

setup.py

@@ -2,14 +2,14 @@
 from setuptools import setup
 
 setup(name='pyTelegramBotAPI',
-      version='0.3.0',
+      version='0.3.1',
       description='Python Telegram bot api. ',
       author='eternnoir',
       author_email='eternnoir@gmail.com',
       url='https://github.com/eternnoir/pyTelegramBotAPI',
       packages=['telebot'],
       license='GPL2',
-      keywords='tools',
+      keywords='telegram bot api tools',
       install_requires=['pytest', 'requests', 'six'],
       classifiers=[
           'Development Status :: 5 - Production/Stable',