Bumped symfony minimum versions

Author: DonCallisto

.travis.yml

@@ -20,9 +20,7 @@ matrix:
     - php: 5.3
       dist: precise
     - php: 7.2
-      env: SYMFONY_VERSION='^2'
-    - php: 7.2
-      env: SYMFONY_VERSION='^3'
+      env: SYMFONY_VERSION='^4'
     # Test against dev dependencies
     - php: 7.2
       env: DEPS=dev

composer.json

@@ -20,7 +20,7 @@
         "php":          ">=5.3.2",
         "behat/behat":  "^3.0.5",
         "behat/mink":   "^1.5",
-        "symfony/config": "^2.7|^3.0|^4.0"
+        "symfony/config": "^3.4|^4.2"
     },
 
     "require-dev": {