Upload to git before uploading to PyPI (#359)

Co-authored-by: Pradyun Gedam <pradyunsg@users.noreply.github.com>
Co-authored-by: Brett Cannon <brett@python.org>

noxfile.py

@@ -148,15 +148,15 @@ def release(session):
     # Check and upload distribution files.
     session.run("twine", "check", *files)
 
-    # Upload the distribution.
-    session.run("twine", "upload", *files)
-
     # Push the commits and tag.
     # NOTE: The following fails if pushing to the branch is not allowed. This can
     #       happen on GitHub, if the master branch is protected, there are required
     #       CI checks and "Include administrators" is enabled on the protection.
     session.run("git", "push", "upstream", "master", release_version, external=True)
 
+    # Upload the distribution.
+    session.run("twine", "upload", *files)
+
 
 # -----------------------------------------------------------------------------
 # Helpers