fix import pip version 10

setup.py

@@ -1,5 +1,8 @@
 #!/usr/bin/env python
 from setuptools import setup, find_packages
+try:
+    from pip._internal.req import parse_requirements as parse
+except ImportError:
     from pip.req import parse_requirements as parse
 
 requirements = lambda f: [str(i.req) for i in parse(f, session=False)]