-PHP7 compatible release based on the 2.5.x series with the following backwards incompatible changes:
-- removed http\Url::FROM_ENV from the default flags of the http\Url constructor, use http\Env\Url instead
+ >*NOTE:*
+ v4.x will be PHP-8 only, v3.x continues PHP-7 support
+
+ * PHP 8 compatibility
+ - Drop ext-propro support
+ PHP 8 removes the object get/set API from the ZendEngine, which renders
+ that extension dysfunctional. As a consequence, the header property of
+ http\Message and derived classes cannot be modified in place, and thus
+ by reference.