(Docs Update Request) stb_image_write.h supports PNG/BMP/TGA/JPEG/HDR

[Lunar2kPS]

In the main README of this project, it has a nice table describing each single-file header library.
For the line on stb_image_write.h, it says it only supports writing PNG, TGA, and BMP files.

The header file as of today says that it supports more:

stb_image_write - v1.16 - public domain - http://nothings.org/stb
   writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015

This was previously called out in issue #636 , but this issue is more of a "may we update the docs please?" question :)
I could make a fork and tiny PR (probably just that 1 line in the README.md), but figured I'd ask first.
Thanks!

[nothings]

README.md is automatically generated from tools\README.list

[Lunar2kPS]

Awesome, thanks for updating that! :)