dev-python/pipenv: update maintainers

Signed-off-by: Oz Tiram <oz.tiram@gmail.com>

dev-python/pipenv/metadata.xml

@@ -5,10 +5,6 @@
 		<email>oz.tiram@gmail.com</email>
 		<name>Oz Tiram</name>
 	</maintainer>
-	<maintainer type="project" proxied="proxy">
-		<email>proxy-maint@gentoo.org</email>
-		<name>Proxy Maintainers</name>
-	</maintainer>
 	<upstream>
 		<maintainer status="active">
 			<email>distutils-sig@python.org</email>