message: Update Vookoo introduction article link
diff: @@ -596,7 +596,7 @@ All those elements will be removed around November 2021.
  Feel free to submit a PR to add to this list.
  - [Examples](https://github.com/jherico/vulkan) A port of Sascha Willems [examples](https://github.com/SaschaWillems/Vulkan) to Vulkan-Hpp
  -- [Vookoo](https://github.com/andy-thomason/Vookoo/) Stateful helper classes for Vulkan-Hpp, [Introduction Article](https://accu.org/index.php/journals/2380).
  +- [Vookoo](https://github.com/andy-thomason/Vookoo/) Stateful helper classes for Vulkan-Hpp, [Introduction Article](https://accu.org/journals/overload/25/139/overload139.pdf#page=14).
  ## License
  