Array and string offset access syntax with curly braces is deprecated

[gerardo1sanchez]

XLSXReader/XLSXReader.php

Line 252 in 10cad4e

$index += (ord($col{$i}) - 64) * pow(26, $colLen-$i-1);

Small sugestion to be compatible with PHP 8 (remove curly braces)

$index += (ord($col[$i]) - 64) * pow(26, $colLen-$i-1);