`electrolinux/php-html5lib` was quite old and incompatible with the upcoming Composer 2.0.
Jumping to `masterminds/html5` for the same result. Also the lib is maintained.
Also:
- keep README in vendors
- use new Scrutinizer engine
- test with lower deps
- remove php-coveralls dev deps and download the phar during the CI build
When composer is used as a dependency manager for large web apps, transferring lots of extra files (such as tests and documentation) can be very time and bandwidth consuming. By using .gitattributes we can tell composer what files to ignore when distributing through composer.
Jeremy Benoist