[chores] Minor setup.py whitespace fix

[skip ci]

Author: nemesifier

setup.py

@@ -56,7 +56,7 @@ def get_install_requires():
     zip_safe=False,
     install_requires=get_install_requires(),
     classifiers=[
-        'Development Status :: 5 - Production/Stable ',
+        'Development Status :: 5 - Production/Stable',
         'Environment :: Web Environment',
         'Topic :: Internet :: WWW/HTTP',
         'Intended Audience :: Developers',