Updated composer dependencies.

Author: ivopetkov

composer.json

@@ -13,7 +13,7 @@
     ],
     "require": {
         "php": ">=7.0.0",
-        "ivopetkov/html5-dom-document-php": ">=0.5.5|0.6.*"
+        "ivopetkov/html5-dom-document-php": "^0.5.5|0.6.*"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8"