!267 Update version number

Merge pull request !267 from pkuliuliu/master

setup.py

@@ -21,7 +21,7 @@ from setuptools import setup
 from setuptools.command.egg_info import egg_info
 from setuptools.command.build_py import build_py
 
-version = '1.5.0'
+version = '1.5.0-rc1'
 cur_dir = os.path.dirname(os.path.realpath(__file__))
 pkg_dir = os.path.join(cur_dir, 'build')