update readme.md python2 requirements
@@ -54,7 +54,7 @@ To see which version of LLVM/Clang is available, use `clang --version`.
We recommend version 8, but also had successes to build Skia with 6.0.1 and 7.0.1, and - on macOS - Apple LLVM version 10. So it's probably best to use the preinstalled version or install version 8 if LLVM is not available on your platform by default.
-For Python, at least version 2.7 _should_ be available! Use `python --version` to see what's there.
+Python version 2.7 _should_ be available. The build script probes for `python --version` and `python2 --version` and uses the first one that looks like a version 2 executable.
### macOS
