update version to 6.0.0.2016.4

Author: tianhao64

setup.py

@@ -29,7 +29,7 @@ def read(fname):
 
 setup(
    name='pyvmomi',
-   version='6.0.0.2016.4.dev0',
+   version='6.0.0.2016.4',
    description='VMware vSphere Python SDK',
    # NOTE: pypi prefers the use of RST to render docs
    long_description=read('README.rst'),