feature #26 Allow Symfony 5 (nicolas-grekas)

This PR was merged into the master branch.

Discussion
----------

Allow Symfony 5

A blocker on the path to using the website-skeleton with SF 5.

Commits
-------

36bb790 Allow Symfony 5

composer.json

@@ -17,7 +17,7 @@
     "require": {
         "php"             : ">=5.3.0",
         "monolog/monolog" : "~1.6",
-        "symfony/yaml"    : "~2.3|~3.0|~4.0"
+        "symfony/yaml"    : "^2.8|^3.4|^4.0|^5.0"
     },
     "autoload": {
         "psr-4": { "EasyCorp\\EasyLog\\": "src" }