Update changelog and add credit

Related to #2593

CONTRIBUTORS.md

@@ -67,6 +67,7 @@ video tutorials.
  - Robin Eklind
  - Jan Ekström
  - Siavash Eliasi
+ - er-azh
  - Ahmad Fatoum
  - Nikita Fediuchin
  - Felipe Ferreira

README.md

@@ -129,6 +129,7 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: The fractional scaling related objects were not destroyed
  - [Wayland] Bugfix: `glfwInit` would segfault on compositor with no seat (#2517)
  - [Wayland] Bugfix: A drag entering a non-GLFW surface could cause a segfault
+ - [X11] Bugfix: Running without a WM could trigger an assert (#2593,#2601,#2631)
  - [Null] Added Vulkan 'window' surface creation via `VK_EXT_headless_surface`
  - [Null] Added EGL context creation on Mesa via `EGL_MESA_platform_surfaceless`
  - [EGL] Allowed native access on Wayland with `GLFW_CONTEXT_CREATION_API` set to