Update due date on assign 4.

Author: dvanhorn

www/assignments/4.scrbl

@@ -2,7 +2,7 @@
 
 @title[#:tag "Assignment 4" #:style 'unnumbered]{Assignment 4: Let There Be (Many) Variables}
 
-@bold{Due: Tuesday, October 29, 11:59PM EST}
+@bold{Due: Thursday, October 31, 11:59PM EST}
 
 The goal of this assignment is to extend a compiler with binding forms and
 primitives that can take any number of arguments.