Fix typo in `setup.py` (#656)

This typo was noticed when copy/pasting the `read` function into my own
`setup.py`.

Thanks a lot, Hynek!

modified:   setup.py

setup.py

@@ -61,7 +61,7 @@ HERE = os.path.abspath(os.path.dirname(__file__))
 
 def read(*parts):
     """
-    Build an absolute path from *parts* and and return the contents of the
+    Build an absolute path from *parts* and return the contents of the
     resulting file.  Assume UTF-8 encoding.
     """
     with codecs.open(os.path.join(HERE, *parts), "rb", "utf-8") as f: