-* Fixed gh-issue #73: build fails with libidn and libidn2
-* Fixed gh-issue #78: PHP-7.3 build crashes
-* Fixed PHP-7.2 build crashes
-+ Added brotli compression support
-+ Implemented gh-issue #58: Notify observers before any request is built
+ >*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.