Update SURVEY.md

Author: feross

src/SURVEY.md

@@ -1,14 +1,14 @@
 # Assignment 0 Survey Questions
 
-## Roughly how long did you spend on this assignment? (required)
+## Roughly how long did you spend on this assignment?
 
 TODO: Replace this with your response
 
-## What was your favorite part of this assignment? (required)
+## What was your favorite part of this assignment and why?
 
 TODO: Replace this with your response
 
-## What was your least favorite part of this assignment? (required)
+## What was your least favorite part of this assignment and why?
 
 TODO: Replace this with your response