IdP not supporting with "simpleSign" binding for logout request.

[PrasanthVijayy]

Hi @tngan & team,

Thank you creating a wonderful package which makes work easier for developers like us.

I like to inform as I try to work for IdP initiated logout, I faced error where I selected "simpleSign" binding.

**"ERR_UNDEFINED_BINDING"**

IdP side Implementation:

// Generate Logout Request XML
const context = await idp.createLogoutRequest(
sp, "simpleSign", 
" ", 
" ",
this.logoutReqTemplateCallback(idp, sp, idp.entitySetting.logoutRequestTemplate.context, response),
);

Hope I made the implementation in right way, kindly support this.

Thanks in Advance!