pep8 fixes for setup.py

as reported by flake8

setup.py

@@ -67,6 +67,7 @@ libgit2_lib = os.getenv('LIBGIT2_LIB', os.path.join(libgit2_path, 'lib'))
 pygit2_exts = [os.path.join('src', name) for name in os.listdir('src')
                if name.endswith('.c')]
 
+
 class TestCommand(Command):
     """Command for running unittests without install."""
 
@@ -155,7 +156,6 @@ class sdist_files_from_git(sdist):
         self.write_manifest()
 
 
-
 cmdclass = {
     'test': TestCommand,
     'sdist': sdist_files_from_git}