Merge pull request #289 from chainer/update-version-v0.4

Update to v0.4

Author: muupan

setup.py

@@ -30,7 +30,7 @@
     install_requires.append('funcsigs')
 
 setup(name='chainerrl',
-      version='0.3.0',
+      version='0.4.0',
       description='ChainerRL, a deep reinforcement learning library',
       author='Yasuhiro Fujita',
       author_email='[email protected]',