message: Fix example component import in material package README
diff: @@ -50,8 +50,8 @@ import { createTheme, ThemeProvider } from '@mui/material/styles';
  import { QueryBuilderMaterial } from '@react-querybuilder/material';
  import { QueryBuilder, RuleGroupType } from 'react-querybuilder';
  // MUI component imports
  +import DragIndicator from '@mui/icons-material/DragIndicator';
  import Checkbox from '@mui/material/Checkbox';
  -import DragIndicator from '@mui/material/DragIndicator';
  import FormControl from '@mui/material/FormControl';
  import FormControlLabel from '@mui/material/FormControlLabel';
  import Input from '@mui/material/Input';
  