Restored compatibility with PHP5

Min version raised to 5.6

Author: Christoph Singer

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 5.4
   - 5.6
   - 7.0
   - 7.1

composer.json

@@ -22,7 +22,7 @@
         }
     },
     "require": {
-        "php": ">=5.4"
+        "php": ">=5.6"
     },
     "suggest": {
         "psr/http-message": "For using the Psr7Uri class implementing Psr\\Http\\Message\\UriInterface"

src/Wa72/Url/Psr7Uri.php

@@ -41,7 +41,7 @@ static function fromUrl(Url $url)
      * @param string $url
      * @return Psr7Uri
      */
-    static function parse(string $url)
+    static function parse($url)
     {
         return new static(Url::parse($url));
     }