* 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
* add assertions in test methods without assertions
* loosen dependencies so 7.0 & 7.1 builds can succeed
* fix some scrutinizer errors
* update release date
