message: fix blockchain explorer link
diff: import api from './api'
  -
  +import link from './link'
  export default {
  BTC: {
  withdrawTransactionHash: `utxoSwapWithdrawTransactionHash`,
  scriptCreatingTransactionHash: `utxoScriptCreatingTransactionHash`, // @to-do - remove this - use directly
  - explorerLink: api.bitpay,
  + explorerLink: link.bitpay,
  verifyScriptFunc: `verifyScript`, // @to-do - remove this - use directly
  scriptValues: `utxoScriptValues`, // @to-do - remove this - use directly utxoScriptValues
  },
  