Update changelog and add credit

Related to #1980

(cherry picked from commit 999962bd2f7e642a8f8ad94e643e53392945caa8)

CONTRIBUTORS.md

@@ -34,6 +34,7 @@ video tutorials.
  - Michał Cichoń
  - Lambert Clara
  - Anna Clarke
+ - Josh Codd
  - Yaron Cohen-Tal
  - Omar Cornut
  - Andrew Corrigan

README.md

@@ -134,6 +134,7 @@ information on what to include when reporting a bug.
    related events were emitted
  - [Cocoa] Bugfix: Moving the cursor programmatically would freeze it for
    a fraction of a second (#1962)
+ - [Cocoa] Bugfix: `kIOMasterPortDefault` was depreacted in macOS 12.0 (#1980)
  - [X11] Bugfix: Changing `GLFW_FLOATING` could leak memory
  - [Wayland] Bugfix: Some keys were not repeating in Wayland (#1908)
  - [Wayland] Bugfix: Non-arrow cursors are offset from the hotspot (#1706,#1899)