Minor updates to 1990

Add thank you note to Cody in some README.md files, remove the warning
that 1990/westley/westley.c might not compile with modern compilers
(since I fixed it) and reworded a statement slightly. Yes I'm thanking
myself but it's actually from the judges.

1990/stig/README.md

@@ -13,7 +13,7 @@
 
 	make all
 
-NOTE: that's not a typo but one can also do:
+NOTE: that's not a typo or mistake but one can also do:
 
 	./o