update php in actions

Author: kpicaza

.github/workflows/coding-standards.yml

@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 

.github/workflows/mutation-tests.yml

@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 

.github/workflows/phpunit.yml

@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 

.github/workflows/psalm.yml

@@ -19,7 +19,7 @@ jobs:
         dependencies:
           - "locked"
         php-version:
-          - "7.4"
+          - "8.0"
         operating-system:
           - "ubuntu-latest"
 

docs/README.md

@@ -127,37 +127,6 @@ class SomeMiddleware implements MiddlewareInterface
 }
 ```
 
-**Coroutine based**
-
-```php
-<?php
-declare(strict_types = 1);
-
-namespace App;
-
-use Antidot\React\PromiseResponse;
-use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\ServerRequestInterface;
-use Psr\Http\Server\MiddlewareInterface;
-use Psr\Http\Server\RequestHandlerInterface;
-use function React\Promise\resolve;
-
-class SomeMiddleware implements MiddlewareInterface
-{
-    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
-    {
-        return PromiseResponse::fromGeneratorCallback(
-            static function(ServerRequestInterface $request) {
-                $value = yield resolve('Some promised value.');
-                $request = $request->withAttribute('some_attribute', $value);
-            
-                return $handler->handle($request));
-            }    
-        );
-    }
-}
-```
-
 ### PSR-7 Request Handler
 
 **Promise Based**
@@ -196,6 +165,7 @@ declare(strict_types = 1);
 namespace App;
 
 use Antidot\React\PromiseResponse;
+use Generator;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
@@ -206,7 +176,7 @@ class SomeRequestHandler implements RequestHandlerInterface
     public function handle(ServerRequestInterface $request): ResponseInterface
     {
         return PromiseResponse::fromGeneratorCallback(
-            function(ServerRequestInterface $request): ResponseInterface {
+            function(ServerRequestInterface $request): Generator {
                 $message = yield resolve('Hello World!!!');
 
                 return new Response($message);