Bug report
Description
Method Oauth2::Client#revoke_token
will always submit request parameters as query string.
Expected behaviour
Method call client.revoke_token('token-string', 'refresh_token', { token_method: :post })
, should make revocation request using x-www-form-urlencoded
header and send parameters as request body.
Actual behaviour
Request will be made with x-www-form-urlencoded
header, but parameters will still be sent as query parameters and body will be empty.