message: Remove React warning
  Fire onOptionChange in componentWillMount, otherwise end up trying
  to update state effectively in a render method, which is bad.
diff: @@ -43,8 +43,10 @@ export default class CountryDropdown extends React.Component {
  this.state = {
  searchQuery: '',
  }
  + }
  - if (!props.value) {
  + componentWillMount() {
  + if (!this.props.value) {
  // If no value is given, we start with the first
  // country selected, but our parent component
  // doesn't know this, therefore we do this.
  