edit README

Author: joel-ling

README.md

@@ -67,7 +67,7 @@ It is highly unlikely that a developer
 would ever need to implement these protocols
 (since in Go, the package [`net`](https://pkg.go.dev/net)
 supplies types and methods that abstract away low-level details),
-but they makes an appropriate illustration of binary message formats.
+but they make appropriate illustrations of binary message formats.
 
 
 ```