update changelog and readme

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Updates
 
+- **15-Dec-2022**: A small but important update in sokol_imgui.h which fixes
+  touch input handling on mobile devices. Many thanks to github user @Xadiant
+  for the bug investigation and [PR](https://github.com/floooh/sokol/pull/760).
+
 - **25-Nov-2022**: Some code cleanup around resource creation and destruction in sokol_gfx.h:
     - It's now safe to call the destroy, uninit and dealloc functions in any
       resource state, in general, the functions will do the right thing without

README.md

@@ -4,7 +4,7 @@ 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) (**25-Nov-2022** sokol_gfx.h: minor breaking change in the ```sg_uninit_*()``` functions)
+[**See what's new**](https://github.com/floooh/sokol/blob/master/CHANGELOG.md) (**15-Dec-2022** sokol_imgui.h: fix touch input on mobile devices)
 
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