message: change default exchange pair at mainnet
diff: @@ -249,7 +249,7 @@ class Exchange extends PureComponent<any, any> {
  }
  let haveCurrency = sell || 'btc'
  - let getCurrency = buy || (!isWidgetBuild ? 'eth' : config.erc20token)
  + let getCurrency = buy || (!isWidgetBuild ? process.env.MAINNET ? 'wbtc' : 'eth' : config.erc20token)
  const exchangeDataStr = localStorage.getItem(constants.localStorage.exchangeSettings)
  const exchangeSettings = exchangeDataStr && JSON.parse(exchangeDataStr)
  