update changelog and readme

CHANGELOG.md

@@ -1,5 +1,29 @@
 ## Updates
 
+- **10-Jul-2022**: New features in sokol_app.h and sokol_imgui.h:
+    - In sokol_app.h it's now possible to set a mouse cursor type from a number of predefined
+      types via the new function ```sapp_set_mouse_cursor(sapp_mouse_cursor cursor)```. The
+      available cursor types are compatible with GLFW and Dear ImGui. Supported platforms
+      are: macOS, linux, win32, uwp and web.
+    - ```sapp_show_mouse(bool shown)``` now also works on the web platform.
+    - In sokol_app.h, the poorly defined 'user cursor' feature has been removed (```sapp_desc.user_cursor```
+      and ```SAPP_EVENTTYPE_UPDATE_CURSOR```). This was a hack to allow changing the mouse cursor and
+      only worked on Win32 and macOS (with different behaviour). Since setting the cursor type
+      is now 'properly supported, this hack was removed.
+    - sokol_imgui.h will now set the cursor type via ```sapp_set_mouse_cursor()```. This can be
+      disabled with the new ```simgui_desc_t``` item ```disable_set_mouse_cursor```.
+    - sokol_imgui.h now automatically enables resizing windows from edges (not just the bottom-right corner),
+      this behavour can be disabled with the new ```simgui_desc_t``` item ```disable_windows_resize_from_edges```.
+    - sokol_imgui.h can now optionally write to the alpha channel (useful if you want to render the UI
+      into a separate render target, which is later composed onto the default framebuffer). The feature
+      is enabled with the new ```simgui_desc_t``` item ```write_alpha_channel```.
+    - sokol_gfx.h has a new function ```sg_query_buffer_will_overflow()```, this allows to check if
+      a sg_append_buffer() call would overflow the buffer.
+
+  Many thanks to **@tomc1998** for the initial [Linux/X11 mouse cursor type PR](https://github.com/floooh/sokol/pull/678),
+  **@luigi-rosso** for the [sokol_imgui.h alpha channel PR](https://github.com/floooh/sokol/pull/687) and
+  **@RandyGaul** for the [sg_query_buffer_will_overflow() PR](https://github.com/floooh/sokol/pull/682)!
+
 - **03-Jul-2022**: A new sokol_gfx.h function ```bool sg_query_buffer_will_overflow(sg_buffer buf, size_t size)```
 which allows to check if a call to ```sg_append_buffer()``` would overflow the buffer. This
 is an alternative to the ```sg_query_buffer_overflow()``` function which only reports

README.md

@@ -4,8 +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) (**29-Jun-2022** sokol_app.h D3D11: in debug
-mode, retry failed device creation without D3D11_CREATE_DEVICE_DEBUG flag)
+[**See what's new**](https://github.com/floooh/sokol/blob/master/CHANGELOG.md) (**10-Jul-2022** sokol_app.h can now set the mouse cursor type, and assorted changes)
 
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