message: Prevented image flicker
  Was creating the component each render. Called function because ListHeaderComponent expects React Element
diff: @@ -8,7 +8,7 @@ export default ({renderHeader, tweets, onTimeline}) => (
  keyExtractor={item => '' + item.id}
  contentInsetAdjustmentBehavior="automatic"
  nestedScrollEnabled={true}
  - ListHeaderComponent={renderHeader}
  + ListHeaderComponent={renderHeader && renderHeader()}
  style={styles.view}
  renderItem={({item}) => (
  <TweetItem {...item} onTimeline={onTimeline} />
  