Update changelog and add credit

Related to #2229

CONTRIBUTORS.md

@@ -215,6 +215,7 @@ video tutorials.
  - Dmitri Shuralyov
  - Joao da Silva
  - Daniel Sieger
+ - Michael Skec
  - Daniel Skorupski
  - Slemmie
  - Anthony Smith

README.md

@@ -390,6 +390,7 @@ information on what to include when reporting a bug.
  - [POSIX] Removed use of deprecated function `gettimeofday`
  - [POSIX] Bugfix: `CLOCK_MONOTONIC` was not correctly tested for or enabled
  - [Linux] Bugfix: Joysticks without buttons were ignored (#2042,#2043)
+ - [Linux] Bugfix: A small amount of memory could leak if initialization failed (#2229)
  - [WGL] Disabled the DWM swap interval hack for Windows 8 and later (#1072)
  - [NSGL] Removed enforcement of forward-compatible flag for core contexts
  - [NSGL] Bugfix: `GLFW_COCOA_RETINA_FRAMEBUFFER` had no effect on newer