Fixed composer autoloading deprecation notice; Support symfony 5 (#115)

* Allow version 5 of symfony packages

* Fixed deprecation notice for class autoloading

Co-authored-by: Brian Wozeniak <brian.wozeniak@ozzu.com>

Author: brianwozeniak

composer.json

@@ -16,9 +16,9 @@
     ],
     "require": {
         "php": ">=7.0.0",
-        "symfony/config": "^2.3|^3.0|^4",
-        "symfony/translation": "^2.3|^3.0|^4",
-        "symfony/yaml": "^2.3|^3.0|^4"
+        "symfony/config": "^2.3|^3.0|^4|^5",
+        "symfony/translation": "^2.3|^3.0|^4|^5",
+        "symfony/yaml": "^2.3|^3.0|^4|^5"
     },
     "require-dev": {
         "thunderer/shortcode": "^0.7",
@@ -31,7 +31,11 @@
     },
     "autoload": {
         "psr-4": {
-            "": "src",
+            "": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
             "Coduo\\PHPHumanizer\\Tests\\": "tests/"
         }
     },