Update assignment1.py

Author: Arun Kirubarajan

assignment1.py

@@ -79,8 +79,7 @@ def my_reduce(function, l, initializer=None):
 class BSTree(object):
  ''' Implement a binary search tree.
  See here: http://en.wikipedia.org/wiki/Binary_search_tree
- or https://www.seas.upenn.edu/~cis120/current/notes/120notes.pdf
- The examples in the test file illustrate the desired behavior.
+ or https://www.cis.upenn.edu/~cis120/current/files/120notes.pdf
 
  Each method you need to implement has its own docstring
  with further instruction. You'll want to move most of the