Support for react/http-client > 0.5.0

[nenad]

Q	A
Bug?	no
New Feature?	yes?
Version	2.1.0

Actual Behavior

wait() method on Promise fails because the LoopInterface::tick() in react/event-loop is internal now.

Expected Behavior

Synchronous requests work when I call the Client::sendRequest() method.

Steps to Reproduce

Update http-client to 0.5.9
Make sure the react/event-loop version is >= 0.5.0 (BC version)
Try to send synchronous request with the Client from this library.

Possible Solutions

reactphp/event-loop#52 (comment)