[TASK] Depend on Symfony 3.4.0 as minimum version (#288)

Also update some other dependencies.

Author: oliverklee

CHANGELOG.md

@@ -15,6 +15,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Bidirectional m:n association Subscribers/SubscriberLists (#254)
 
 ### Changed
+- Depend on Symfony 3.4.0 as minimum version (#288)
 - Move the PHPUnit configuration file (#283)
 - Rename the Composer package to "phplist/core" (#275)
 - Remove the obsolete core classes (#267)

composer.json

@@ -36,13 +36,13 @@
         "doctrine/orm": "^2.5.0",
         "doctrine/common": "^2.6.0",
         "doctrine/doctrine-bundle": "^1.8.0",
-        "symfony/symfony": "^3.3.0",
+        "symfony/symfony": "^3.4.0",
         "symfony/monolog-bundle": "^3.1.0",
-        "symfony/dependency-injection": "^3.0.0",
-        "symfony/config": "^3.0.0",
-        "symfony/yaml": "^3.0.0",
-        "jms/serializer-bundle": "^2.2",
-        "sensio/framework-extra-bundle": "^3.0.0",
+        "symfony/dependency-injection": "^3.4.0",
+        "symfony/config": "^3.4.0",
+        "symfony/yaml": "^3.4.0",
+        "jms/serializer-bundle": "^2.3",
+        "sensio/framework-extra-bundle": "^5.1.0",
         "sensio/distribution-bundle": "^5.0.6"
     },
     "require-dev": {
@@ -53,9 +53,9 @@
         "squizlabs/php_codesniffer": "^3.2.0",
         "phpstan/phpstan": "^0.7.0",
         "nette/caching": "^2.5.0 || ^3.0.0",
-        "nikic/php-parser": "^3.0.0",
+        "nikic/php-parser": "^3.1.0",
         "phpmd/phpmd": "^2.6.0",
-        "composer/composer": "^1.5.0"
+        "composer/composer": "^1.6.0"
     },
     "suggest": {
         "phplist/web-frontend": "4.0.x-dev",