fix symfony package versions

composer.json

@@ -26,8 +26,11 @@
         "zizaco/entrust": "5.2.x-dev",
         "prettus/l5-repository": "2.6.x",
         "spatie/laravel-pjax": "1.3.x",
+        "symfony/inflector": "v3.4.0",
         "symfony/event-dispatcher": "v3.4.0",
-        "symfony/yaml": "3.3.x",
+        "symfony/yaml": "v3.4.0",
+        "symfony/css-selector": "v3.4.0",
+        "symfony/dom-crawler": "v3.4.0",
         "league/geotools": "@stable",
         "toin0u/geotools-laravel": "^1.0",
         "anlutro/l4-settings": "0.5.x",
@@ -39,8 +42,6 @@
         "makinacorpus/php-bloom": "dev-master",
         "hashids/hashids": "2.0.*",
         "maatwebsite/excel": "2.1.*",
-        "symfony/css-selector": "3.1.*",
-        "symfony/dom-crawler": "3.3.*",
         "phpunit/phpunit": "6.4.0",
         "scriptfusion/phpunit-immediate-exception-printer": "1.3.0",
         "nwidart/laravel-modules": "^2.6",