PHP 7.3 support

[kappaj]

I got an error when using this bundle with PHP 7.3:

An exception has been thrown during the rendering of a template ("Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"?").

The exception is caused from:

in \vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/OLE.php (line 323)

I think it should be

continue 2;