message: try to fix flow issues that show up on circleci but not on my machine
diff: @@ -402,9 +402,9 @@ function makeUpdate(fullyQualifiedName: string,
  ownerKeyHex: string,
  paymentKeyHex: string,
  zonefile: string,
  - valueHash: ?string = null) {
  + valueHash: string = '') {
  const network = config.network
  - if (!valueHash) {
  + if (valueHash.length === 0) {
  if (!zonefile) {
  throw new Error('Need zonefile or valueHash arguments')
  }
  @@ -509,7 +509,7 @@ function makeTransfer(fullyQualifiedName: string,
  destinationAddress: string,
  ownerKeyHex: string,
  paymentKeyHex: string,
  - keepZonefile: ?boolean = false) {
  + keepZonefile: boolean = false) {
  const network = config.network
  const ownerKey = hexStringToECPair(ownerKeyHex)
  const paymentKey = hexStringToECPair(paymentKeyHex)
  