update README

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 # LZR
-Simple C game framework based on SDL2.
-LZR is meant to be used in my own games as a base,
-while staying simple, flexible and easy to grasp at the core.
+Simple C/C++ game framework based on SDL2.
+LZR is used in [my own games](https://kdx.re/games) as a base.
+It should stay simple, flexible and easy to grasp at the core.
 
 ## dependencies
-LZR depends on SDL2, SDL2_gfx, SDL_image, SDL_mixer and
-[libdx](https://git.sr.ht/~kikoodx/libdx).
+LZR depends on [SDL2](https://libsdl.org),
+and has opt-out dependencies on
+[SDL2_gfx](https://www.ferzkopp.net/wordpress/2016/01/02/sdl_gfx-sdl2_gfx/),
+[SDL_image 2.0](https://github.com/libsdl-org/SDL_image), and
+cmixer.
 
 ## usage
-Drop lzr.c and lzr.h in a project, add flags for the dependencies.
+Drop lzr.c and lzr.h in a project, add flags for the dependencies
+(see this project's Makefile for sane defaults).
 
 Initialize LZR with `LZR_Init()`, quit and cleanup with `LZR_Quit()`.
 Header is self documented, see `lzr.h`.
 
 ## license
-LZR is under the MIT license, see LICENSE for details.
+LZR is under the MIT license, see [LICENSE](LICENSE) for details.