changed square.py to use list iteration, ck #1

I thought the directions were very clear for the list iteration although
I did need to read through them several times, and tried to understand
what they were saying before opening the file. I then ran the original
code to see what it did, so I could compare my final product. As I
worked on the list iteration, I also kept the original code at top
commented out so I could refer to it, and did not delete it until I was
sure my iteration method worked. I was not totally sure if I could call
the list whatever I wanted to, but it seems like I could as long as one
of the names is singular and the other is plural. I feel like I have a
good grasp of iteration after this part.

square.py

@@ -1,12 +1,11 @@
 from turtle import *
 
+
+
 def square(side_length):
-    forward(side_length)
-    right(90)
-    forward(side_length)
-    right(90)
-    forward(side_length)
-    right(90)
+    sides = [1,2,3,4]
+
+    for side in sides:
         forward(side_length)
         right(90)