typecheck: diagnose missing unchecked function args

README.md

@@ -146,6 +146,7 @@ DO square "oops"
 ```text
 Type mismatch for function square: parameter amount needs NUMBER, but this argument looks like TEXT.
 Function square needs argument amount as NUMBER, but this call does not provide it.
+Function greet needs 1 argument, but this call gives 0. Add the missing argument.
 Function square only accepts 1 argument, but this call gives 2. Remove the extra argument.
 Function squre is not known yet. Check the function name or add TEACH squre before calling it.
 ```