'Looks at the CORS method. Anything other than GET is flagged.
return: [list of AuditIssues]'

def _cors_method(self, cors_list, error_cat='CORS'):

    errors = []
    for cors in cors_list:
        methods = cors.get('method')
        for method in methods:
            if (method == '*'):
                method = 'ALL'
            if (method != 'GET'):
                ae = make_audit_issue(error_cat, 'METHOD', method)
                errors.append(ae)
    return errors
