mention PR #483 in changelog and readme

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 > NOTE: this list will usually only be updated with changes that affect the public APIs
 
+- **22-Feb-2021**: Mouse input latency in sokol_app.h's macOS backend has been
+  quite significantly reduced, please see the detailed explanation [in this
+  PR](https://github.com/floooh/sokol/pull/483). Many thanks to @randrew for
+  the PR!
+
 - **19-Feb-2021**: sokol_app.h learned some Windows-specific config options
 to redirect stdout/stderr to the parent terminal or a separate console
 window, and allow outputting UTF-8 encoded text. For details, search for

README.md

@@ -6,7 +6,7 @@ Simple
 [STB-style](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt)
 cross-platform libraries for C and C++, written in C.
 
-[**See what's new**](https://github.com/floooh/sokol/blob/master/CHANGELOG.md) (**19-Feb-2021**: sokol_app.h learned some Windows-specific stdout/stderr console configuration options)
+[**See what's new**](https://github.com/floooh/sokol/blob/master/CHANGELOG.md) (**22-Feb-2021** sokol_app.h: mouse latency reduction on macOS)
 
 ## Examples and Related Projects