code: function removes(result, callback) {
                  let fns = result.AttachedPolicies.map(p=> {
                    return function maybeRemove(callback) {
                      let PolicyArn = p.PolicyArn
                      if (policies.includes(PolicyArn)) {
                        callback()
                      }
                      else {
                        iam.detachRolePolicy({
                          RoleName,
                          PolicyArn
                        }, callback)
                      }
                    }
                  })
                  series(fns, callback)
                }
docs: if not in the list remove it