README: fix up Go minimum requirement

mvdan · mvdan · commit 0b253f12c290 · 2024-09-05T21:20:01.000+01:00
diff --git a/README.md b/README.md
@@ -2,7 +2,7 @@
 
 	go install mvdan.cc/garble@latest
 
-Obfuscate Go code by wrapping the Go toolchain. Requires Go 1.20 or later.
+Obfuscate Go code by wrapping the Go toolchain. Requires Go 1.22 or later.
 
 	garble build [build flags] [packages]
 
