Cannot populate sheet if columns are less than fields.

Hi There.

A default new sheet has 26 columns (A-Z)
My form had 30 fields, which caused the sheet to not populate since it cant update a nonexistent cell.

To fix this, on line 85 of ./lib/google-sheets.php I added a check for the column count and the number of field, then updated the columns in the sheet to match.

if( count( $data ) > $worksheet->getColCount() ){
	$worksheet->update( null, count( $data ) );
}

All the best,
~ David