fix getAddress regex condition

src/Gemtext/Link.php

@@ -15,7 +15,7 @@ class Link
 
     public function getAddress(): ?string
     {
-        if (preg_match('/^([^\s]+)\s.*/', trim($this->_line), $match))
+        if (preg_match('/^=>\s*([^\s]+)/', trim($this->_line), $match))
         {
             return trim(
                 $match[1]