note in README.md that this project supports multiple python versions

Author: marler8997

README.md

@@ -5,3 +5,5 @@ Builds [cpython](https://github.com/python/cpython) with [Zig](https://ziglang.o
 There are no system dependencies; the only thing required to build this package is [Zig](https://ziglang.org/).
 
 Supports building a static python executable for linux with the musl abi (i.e. `zig build -Dtarget=x86_64-linux-musl`).
+
+This project also supports building multiple versions of python.