improvements

Author: erelke

composer.json

@@ -16,16 +16,16 @@
         }
     ],
     "require": {
-        "php": ">=7.0",
-        "symfony/framework-bundle": "~3.2|~4.0",
+        "php": ">=7.1",
+        "symfony/framework-bundle": "~3.4|~4.0",
         "twig/twig": "~2.0",
         "phpoffice/phpspreadsheet": "~1.7.0"
     },
     "require-dev": {
         "symfony/symfony": "~3.4|~4.0",
         "sensio/framework-extra-bundle": "~3.0|~4.0",
-        "symfony/phpunit-bridge": "~4.0",
-        "phpunit/phpunit": "^6.5",
+        "symfony/phpunit-bridge": "^4.0",
+        "phpunit/phpunit": "^7.5",
         "mpdf/mpdf": "~7.0"
     },
     "suggest": {