def update_membership(organization_id, membership_id, params)
      http.put("#{membership_endpoint(organization_id)}/#{membership_id}", body: params) do |response|
        Rexpense::Entities::Membership.new response.parsed_body
      end
    end
def update_membership(organization_id, membership_id, params)
      http.put("#{membership_endpoint(organization_id)}/#{membership_id}", body: params) do |response|
        Rexpense::Entities::Membership.new response.parsed_body
      end
    end
Update organization membership

 [API]
   Method: <tt>PUT /api/v1/organizations/:id/memberships/:membership_id</tt>

   Documentation: http://developers.rexpense.com/api/memberships#update