Remove symfony/finder from dependencies

Author: akondas

composer.json

@@ -6,8 +6,7 @@
         "php": "^7.1",
         "phpstan/phpstan": "^0.10.7",
         "nikic/php-parser": "^4.1",
-        "phpspec/phpspec": "^5.1",
-        "symfony/finder": "^4.2"
+        "phpspec/phpspec": "^5.1"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0",