allow global column header cell override: <HeaderRow>   <Cell component={({columnName})=> <th>{columnName.toUpperCase()}</th>} /> </HeaderRow>
allow global column header cell override:
<HeaderRow>
  <Cell component={({columnName})=> <th>{columnName.toUpperCase()}</th>} />
</HeaderRow>

eddyson-de/react-grid,eddyson-de/react-grid