document python 3.11 support (#600)

Author: kurtbrose

README.md

@@ -9,7 +9,7 @@ py-spy is extremely low overhead: it is written in Rust for speed and doesn't ru
 in the same process as the profiled Python program. This means py-spy is safe to use against production Python code.
 
 py-spy works on Linux, OSX, Windows and FreeBSD, and supports profiling all recent versions of the CPython
-interpreter (versions 2.3-2.7 and 3.3-3.10).
+interpreter (versions 2.3-2.7 and 3.3-3.11).
 
 ## Installation