Merge pull request ccxt#12285 from ttodua/patch-3

added `react/http` in instructions

wiki/Manual.md

@@ -1470,7 +1470,7 @@ $kernel->execute(function() use ($loop, $kernel) {
 $kernel->run();
 ```
 
-See further examples in the `examples/php` directory; look for filenames that include the `async` word. Also, make sure you have installed the required dependencies using `composer require recoil/recoil clue/buzz-react react/event-loop recoil/react`. Lastly, [this article](https://sergeyzhuk.me/2018/10/26/from-promise-to-coroutines/) provides a good introduction to the methods used here. While syntactically the change is simple (i.e., just using a `yield` keyword before relevant methods), concurrency has significant implications for the overall design of your code.
+See further examples in the `examples/php` directory; look for filenames that include the `async` word. Also, make sure you have installed the required dependencies using `composer require recoil/recoil clue/buzz-react react/event-loop recoil/react react/http`. Lastly, [this article](https://sergeyzhuk.me/2018/10/26/from-promise-to-coroutines/) provides a good introduction to the methods used here. While syntactically the change is simple (i.e., just using a `yield` keyword before relevant methods), concurrency has significant implications for the overall design of your code.
 
 ### Returned JSON Objects