Source: https://discourse.libsdl.org/t/sdl-2-0-20-released/34407

SDL 2.0.20 released! slouken […]
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SDL 2.0.20 released!
slouken

Thanks to all the people who contributed code and feedback, SDL 2.0.20 is now available!

https://www.libsdl.org/download-2.0.php

This is largely a bugfix release, with the following changes:

General:

SDL_RenderGeometryRaw() takes a pointer to SDL_Color, not int. You can cast color data in SDL_PIXELFORMAT_RGBA32 format (SDL_PIXELFORMAT_ABGR8888 on little endian systems) for this parameter.
Improved accuracy of horizontal and vertical line drawing when using OpenGL or OpenGLES
Added the hint SDL_HINT_RENDER_LINE_METHOD to control the method of line drawing used, to select speed, correctness, and compatibility.

Windows:

Fixed size of custom cursors

Linux:

Fixed hotplug controller detection, broken in 2.0.18