message: remove async where not used
diff: @@ -148,7 +148,7 @@ export default class AddOffer extends Component {
  })
  }
  - handleBuyCurrencySelect = async ({ value }) => {
  + handleBuyCurrencySelect = ({ value }) => {
  const { buyCurrency, sellCurrency, buyAmount, sellAmount } = this.state
  if (sellCurrency === value) {
  @@ -172,7 +172,7 @@ export default class AddOffer extends Component {
  }
  }
  - handleSellCurrencySelect = async ({ value }) => {
  + handleSellCurrencySelect = ({ value }) => {
  const { buyCurrency, sellCurrency, sellAmount, buyAmount } = this.state
  if (buyCurrency === value) {
  this.switching()
  