Lesson 20 rename

Author: dmitriz

examples/list-comprehensions.js renamed to examples/20-list-comprehensions.js

@@ -6,7 +6,7 @@ const res = List.of( x => x )
 console.log(res)
 
 
-const merch = () =>
+const merch = _ =>
   List.of( x => y => `${x}-${y}`)
 
   // partially apply to list of values 'x'