Update setup.cfg metadata - => _

Change dashes in names to underscores to get rid of warnings when
building a package.

Fixes: GH-53

Author: msabramo

setup.cfg

@@ -1,12 +1,12 @@
 [metadata]
 name = requests-unixsocket
 author = Marc Abramowitz
-author-email = marc@marc-abramowitz.com
+author_email = marc@marc-abramowitz.com
 summary = Use requests to talk HTTP via a UNIX domain socket
-description-file = README.rst
+description_file = README.rst
 license = Apache-2
-home-page = https://github.com/msabramo/requests-unixsocket
-# home-page = https://requests-unixsocket.readthedocs.org/
+home_page = https://github.com/msabramo/requests-unixsocket
+# home_page = https://requests-unixsocket.readthedocs.org/
 classifier =
     Development Status :: 3 - Alpha
     Intended Audience :: Developers