Upgrade to omniauth-oauth2 1.4.0 and fix callback url issue #1
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Omniauth defines callback URL as:
full_host + script_name + callback_path + query_string
(via https://github.com/intridea/omniauth/blob/1cc1cf4b2821a7d2a4a376a5ca93c61b6bd8b5f1/lib/omniauth/strategy.rb#L432)
Omniauth-oauth2 declines to override this after
omniauth/omniauth-oauth2#70
So, this library is overriding omniauth itself, and
omitting the query string from the callback_url (which
Azure AD seems to have trouble with).