symfony 5.2, phpspreadsheet 1.17

Upgrade to symfony 5.2 & phpspreadsheet 1.17

Update to phpofficespreadsheet 1.10.0

Merge pull request #1 from Gerben321/master

Update phpspreadsheet 1.10.0

Update to phpofficespreadsheet 1.9.0

1.6

update to phpspreadsheet 1.9.0

Fix tests, update phpspreadsheet 1.8.2

1.5

Update to phpspreadsheet 1.8.2

fix tests, improve code, rename namespace, etc

1.4

update readme

Improve code quality & tests

Remove deprecations, fix tests, etc.

Update to phpofficespreadsheet 1.8.1

security bugfixes

Improvements

1.2.4

improvements

Update to phpspreadsheet 1.7.0

Update to phpspreadsheet 1.7.0, and PHPUnit 7.5.3

Update to phpspreadsheet 1.6.0

1.2.2

update to phpspreadsheet 1.6.0