Add mbstring extension as dependency in composer.json

Author: jdecool

composer.json

@@ -16,11 +16,15 @@
     ],
     "require": {
         "php": ">=5.6.0",
+        "ext-mbstring": "*",
         "ext-pcre": "*"
     },
     "autoload": {
         "psr-4": {
             "Novutec\\DomainParser\\": "src"
         }
+    },
+    "config": {
+        "sort-packages": true
     }
 }