New release necessary to ship out base64 upgrade and safely support Python 3.9

[palewire]

Here's what version 1.1.0 crashes with in Python 3.9. I believe it is because encodestring has been deprecated.

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2088, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2073, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2070, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1515, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1513, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1499, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/usr/local/lib/python3.9/site-packages/flask_cors/decorator.py", line 128, in wrapped_function
    resp = make_response(f(*args, **kwargs))
  File "/usr/src/app/server/app.py", line 161, in login
    return do_auth(backend)
  File "/usr/local/lib/python3.9/site-packages/social_core/actions.py", line 29, in do_auth
    return backend.start()
  File "/usr/local/lib/python3.9/site-packages/social_core/backends/base.py", line 35, in start
    return self.strategy.redirect(self.auth_url())
  File "/usr/local/lib/python3.9/site-packages/social_core/backends/oauth.py", line 324, in auth_url
    params = self.auth_params(state)
  File "/usr/local/lib/python3.9/site-packages/social_core/backends/open_id_connect.py", line 98, in auth_params
    params['nonce'] = self.get_and_store_nonce(
  File "/usr/local/lib/python3.9/site-packages/social_core/backends/open_id_connect.py", line 108, in get_and_store_nonce
    self.strategy.storage.association.store(url, association)
  File "/usr/local/lib/python3.9/site-packages/social_sqlalchemy/storage.py", line 218, in store
    assoc.secret = base64.encodestring(association.secret).decode()
AttributeError: module 'base64' has no attribute 'encodestring'