Bump the symfony and phpunit dependencies

Author: globtec

.travis.yml

@@ -1,7 +1,7 @@
 language: php
 
 php:
-    - 7.1.3
+    - 7.2.5
 
 before_install:
     - composer self-update

composer.json

@@ -17,13 +17,13 @@
         }
     ],
     "require": {
-        "php": "^7.1.3",
+        "php": "^7.2.5",
         "ext-mbstring": "*",
-        "symfony/console": "^4.0|^5.0",
-        "symfony/yaml": "^4.2|^5.0"
+        "symfony/console": "^4.4|^5.0",
+        "symfony/yaml": "^4.4|^5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.0.1",
+        "phpunit/phpunit": "^8.0.0",
         "mikey179/vfsstream": "^1.6",
         "php-coveralls/php-coveralls" : "v2.0.0"
     },