Require setuptools (because of pkg_resources)

See pre-commit/pre-commit#2122

setup.py

@@ -32,7 +32,7 @@ def read_file(file_name):
     license='BSD',
     author='Eugene Kalinin',
     author_email='e.v.kalinin@gmail.com',
-    install_requires=[],
+    install_requires=['setuptools'],
     description="Node.js virtual environment builder",
     long_description=ldesc,
     py_modules=['nodeenv'],