Fix 2006/sloane for clang

The problem was that the second arg was not of type char ** but an
implicit int and broken record though I am clang forces the types to be
correct without any option to disable this.

As it happens though the second arg is not even used so I removed it as
clang does allow this for some reason. This helps with keeping the
original format as close as possible. This triggers a different warning
but that's okay.

I also added a warning to the README.md about how it is a lot of change
in text very quickly as this could cause some problems for some people.

2006/sloane/README.md

@@ -11,13 +11,25 @@
 make
 ```
 
-### To run:
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this entry to
+work with clang which is stricter on the type of args to main(). Curiously
+although clang requires the types of args to be strictly correct it allows for
+only one arg which he made it as the second arg was not used and this allows for
+a closer match to the original format of the entry. Thank you Cody for your
+assistance!
+
+
+## To run:
 
 ```sh
 ./slone
 ```
 
-### Try:
+WARNING: if you are easily overstimulated with fast movement or have
+photosensitivity please be careful running this entry!
+
+
+## Try:
 
 ```sh
 echo "Do or do not. There is no try."