setup.py was not executable in Python3.7

setup.py

@@ -10,7 +10,7 @@ __AUTHOR_EMAIL__ = 'davidhalter88@gmail.com'
 # Get the version from within jedi. It's defined in exactly one place now.
 with open('jedi/__init__.py') as f:
     tree = ast.parse(f.read())
-version = tree.body[1].value.s
+version = tree.body[int(not hasattr(tree, 'docstring'))].value.s
 
 readme = open('README.rst').read() + '\n\n' + open('CHANGELOG.rst').read()
 with open('requirements.txt') as f: