Fix chapter order and add 'keycloak.preferred_username' option (#109)

README.md

@@ -287,21 +287,6 @@ Auth::hasAnyRole('myapp-frontend', ['myapp-frontend-role1', 'myapp-frontend-role
 Auth::hasAnyRole('myapp-backend', ['myapp-frontend-role1', 'myapp-frontend-role2']) // false
 ```
 
-# Acting as a Keycloak user in tests
-
-As an equivelant feature like `$this->actingAs($user)` in Laravel, with this package you can use `KeycloakGuard\ActingAsKeycloakUser` trait in your test class and then use `actingAsKeycloakUser()` method to act as a user and somehow skip the Keycloak auth:
-
-```php
-use KeycloakGuard\ActingAsKeycloakUser;
-
-public test_a_protected_route()
-{
-    $this->actingAsKeycloakUser()
-        ->getJson('/api/somewhere')
-        ->assertOk();
-}
-```
-
 #### Scope
 Example decoded payload:
 ```json
@@ -338,6 +323,23 @@ Auth::hasAnyScope(['scope-a', 'scope-d']) // true
 Auth::hasAnyScope(['scope-f', 'scope-k']) // false
 ```
 
+# Acting as a Keycloak user in tests
+
+As an equivelant feature like `$this->actingAs($user)` in Laravel, with this package you can use `KeycloakGuard\ActingAsKeycloakUser` trait in your test class and then use `actingAsKeycloakUser()` method to act as a user and somehow skip the Keycloak auth:
+
+```php
+use KeycloakGuard\ActingAsKeycloakUser;
+
+public test_a_protected_route()
+{
+    $this->actingAsKeycloakUser()
+        ->getJson('/api/somewhere')
+        ->assertOk();
+}
+```
+
+If you are not using `keycloak.load_user_from_database` option, set `keycloak.preferred_username` with a valid `preferred_username` for tests.
+
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