Merge pull request #13 from bookboon/feature/sf5

Enable use with Symfony 5

Author: lkm

composer.json

@@ -15,9 +15,9 @@
     ],
     "require": {
         "php": ">=7.1",
-        "symfony/dependency-injection": "~4.0",
-        "symfony/config": "~4.0",
-        "symfony/cache": "~4.0",
+        "symfony/dependency-injection": "^4.0|^5.0",
+        "symfony/config": "^4.0|^5.0",
+        "symfony/cache": "^4.0|^5.0",
         "bookboon/api": "~4.0"
     },
     "autoload": {