avoid import during install

setup.py

@@ -1,9 +1,15 @@
 #!/usr/bin/env python3
 from setuptools import find_packages, setup
 
+def get_version(prefix):
+    import re
+    with open(os.path.join(prefix, '__init__.py')) as fd:
+        metadata = dict(re.findall("__([a-z]+)__ = '([^']+)'", fd.read()))
+    return metadata['version']
+
 setup(
     name='django-requestuser',
-    version=__import__('requestuser').__version__,
+    version=get_version('requestuser'),
     description='Make current request.user available to templates',
     author='j',
     author_email='j@mailb.org',