chore: remove unused badges, update author_email (#381)

diff --git a/setup.py b/setup.py
index 42cf4fb..28b302f 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@
     name="google-auth",
     version=version,
     author="Google Cloud Platform",
-    author_email="[email protected]",
+    author_email="[email protected]",
     description="Google Authentication Library",
     long_description=long_description,
     url="https://github.com/GoogleCloudPlatform/google-auth-library-python",