Issue #2442411 by jhedstrom: Update react/promise to 2.2.0

core/composer.lock

core/vendor/composer/autoload_files.php

core/vendor/composer/installed.json

core/vendor/react/promise/CHANGELOG.md

core/vendor/react/promise/README.md

core/vendor/react/promise/composer.json

core/vendor/react/promise/src/Deferred.php

core/vendor/react/promise/src/ExtendedPromiseInterface.php

core/vendor/react/promise/src/FulfilledPromise.php

core/vendor/react/promise/src/LazyPromise.php

core/vendor/react/promise/src/Promise.php

core/vendor/react/promise/src/RejectedPromise.php

.../vendor/react/promise/src/UnhandledRejectionException.php

core/vendor/react/promise/src/functions.php

core/vendor/react/promise/src/functions_include.php

core/vendor/react/promise/tests/DeferredTest.php

core/vendor/react/promise/tests/FulfilledPromiseTest.php

.../vendor/react/promise/tests/FunctionCheckTypehintTest.php

core/vendor/react/promise/tests/FunctionResolveTest.php

core/vendor/react/promise/tests/LazyPromiseTest.php