Note SDL requirements have changed.

Author: HexDecimal

README.rst

@@ -48,7 +48,7 @@ For the most part it's just::
 ==============
 * Python 3.7+
 * Windows, Linux, or MacOS X 10.9+.
-* On Linux, requires libsdl2 (2.0.5+).
+* On Linux, requires libsdl2 (2.0.10+).
 
 ===========
  Changelog

build_sdl.py

@@ -17,6 +17,7 @@
 
 BITSIZE, LINKAGE = platform.architecture()
 
+# Reject versions of SDL older than this, update the requirements in the readme if you change this.
 SDL_MIN_VERSION = (2, 0, 10)
 # The SDL2 version to parse and export symbols from.
 SDL2_PARSE_VERSION = os.environ.get("SDL_VERSION", "2.0.20")