Mark FulfilledPromise, RejectedPromise and LazyPromise as deprecated for Promise v2 (and remove for Promise v3). (#143 and #165 by @clue)

// deprecated
$fulfilled = new React\Promise\FulfilledPromise($value);
$rejected = new React\Promise\RejectedPromise($reason);

// recommended alternatives
$fulfilled = React\Promise\resolve($value);
$rejected = React\Promise\reject($reason);

Fix: Fix checking whether cancellable promise is an object and avoid possible warning. (#168 by @smscr and @jsor)

Improve documentation and add docblocks to functions and interfaces. (#135 by @CharlotteDunois)

Add .gitattributes to exclude dev files from exports. (#154 by @reedy)

Improve test suite, run tests on PHP 7.4 and update PHPUnit test setup. (#163 by @clue)