Fix flake8 errors

./setup.py:20: [E305] expected 2 blank lines after class or function definition, found 1
requirements = []
^

Author: jcfr

setup.py

@@ -17,6 +17,7 @@
 def _parse_requirements(filename):
     return [str(ir.req) for ir in parse_requirements(filename, session=False)]
 
+
 requirements = []
 dev_requirements = _parse_requirements('requirements-dev.txt')