~ancarda/high-test-coverage

Implement wrapper around random_bytes
Add check-everything command
Make DocBlocks more uniform
Bump dependencies
Implement DateTimeImmutable wrapper
Improve RandomInt tests
Make DocBlocks more generic and reusable
Make CI config more portable
CI improvements and fixes

Fix builds to run correctly on PHP 7.3 and ping Packagist to sync on
every push.
Add project description to README
Correct CI pipeline

Additionally add a command to poke Packagist
Initial commit