Removed unsued var

CONTRIBUTING.md

@@ -169,6 +169,7 @@ Improve PHP exeution time by using [fully-qualified function calls](https://veew
 
 ```bash
 php-cs-fixer fix src/ --rules=native_function_invocation --allow-risky=yes
+php-cs-fixer fix src/ --rules=no_unused_imports --dry-run
 ```
 
 ## Tutorials

app/controllers/api/avatars.php

@@ -26,7 +26,7 @@ $types = [
     'flags' => include __DIR__.'/../../config/avatars/flags.php',
 ];
 
-$avatarCallback = function ($type, $code, $width, $height, $quality) use ($types, $response, $request) {
+$avatarCallback = function ($type, $code, $width, $height, $quality) use ($types, $response) {
     $code = \strtolower($code);
     $type = \strtolower($type);