[google compat] client_auth_method option
Merge branch 'feature/client_auth_method_option' of github.com:finnlabs/omniauth-openid-connect into finnlabs-feature/client_auth_method_option

Conflicts:
	test/lib/omniauth/strategies/openid_connect_test.rb
Merge branch 'finnlabs-feature/client_auth_method_option'