Merge pull request #9 from nunomaduro/patch-1

Update composer.json

Author: cmgmyr

composer.json

@@ -22,7 +22,7 @@
         "ext-dom": "*",
         "ext-json": "*",
         "sebastian/cli-parser": "^1.0|^2.0|^3.0",
-        "phpunit/php-file-iterator": "^3.0|^4.0|^5.0"
+        "phpunit/php-file-iterator": "^3.0|^4.0|^5.0|^6.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.2",