v4.1.0

Note: oauth2client is now deprecated. No more features will be added to the
libraries and the core team is turning down support. We recommend you use
google-auth and oauthlib.

New features:

• Allow customizing the GCE metadata service address via an env var. (#704)
• Store original encoded and signed identity JWT in OAuth2Credentials. (#680)
• Use jsonpickle in django contrib, if available. (#676)

Bug fixes:

• Typo fixes. (#668, #697)
• Remove b64 padding from PKCE values, per RFC7636. (#683)
• Include LICENSE in Manifest.in. (#694)
• Fix tests and CI. (#705, #712, #713)
• Escape callback error code in flask_util. (#710)