IHF: Fixed spatie/array-to-xml version - support of php56.

Author: dmitry-ivanov

composer.json

@@ -17,7 +17,7 @@
         "symfony/finder": "^2.7|^3.0",
         "symfony/process": "^2.7|^3.0",
         "symfony/var-dumper": "^2.7|^3.0",
-        "spatie/array-to-xml": "^2.2"
+        "spatie/array-to-xml": "~2.3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0",