fix: Remove py2 tag from wheel (#343)

Co-authored-by: Anthonios Partheniou <partheniou@google.com>
diff --git a/setup.cfg b/setup.cfg
index 0be0b3f..8857e9b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,3 @@
-[bdist_wheel]
-universal = 1
-
 [pytype]
 python_version = 3.6
 inputs =