\Symfony\Component\Process\Process refuses being passed a string
with version > 5, which is installed with PHP > 7.2.5.
It also refuses being passed an array with version < 3.3, which is
installed with PHP < 5.5.9.
Solved by checking if Process::fromShellCommandLine() exists, which
was introduced in version 4.2.0.
* Improve Title parsing
- Title should be able to contain TextRun
- Style 'Title' should be treated the same with as Heading
- Add tests for Heading/Title reader
* update the documentation and the changelog
* PHP 7.2 build should not fail anymore
* reduce dependencies versions
* fix parsing of footnotes and endnotes
* add method to remove an element from a section
* make FontStyle based on paragraph if it set
* replace tab with spaces
* basedOn not correctly set if FontStyle is based on other FontStyle
* Fix warnings