Fix Quickstart compatibility between joomla/di and psr/container.

Author: Bilge

.github/workflows/Quickstart.yaml

@@ -42,7 +42,7 @@ jobs:
         run: composer require provider/european-central-bank
 
       - name: Require DI library
-        run: composer require joomla/di
+        run: composer require --with-dependencies joomla/di
 
       - name: Run PHP script
         run: | 

docs/Quickstart.md

@@ -26,7 +26,7 @@ composer require provider/european-central-bank
 We now have the provider installed along with all its dependencies, including Porter herself. We want to create a `new Porter` instance now, but we need to pass a `ContainerInterface` to her constructor. [Any PSR-11 container][PSR-11 search] is valid, but let's use [Joomla DI][] for now.
 
 ```sh
-composer require joomla/di
+composer require --with-dependencies joomla/di
 ```
 
 Create a new container and register an instance of `EuropeanCentralBankProvider` with it. Pass the container to a new Porter instance. Don't forget to include the autoloader!