Update README.md

Author: kathyz95

Classroom Challenge Projects/Projects/Quarter-Car Suspension Modeling and Simulation with Simscape Multibody/README.md

@@ -169,8 +169,8 @@ Open the "QuarterCarSuspension_StudentProjectTemplate.mlx" Live Script in MATLAB
 
 ## Project Difficulty
 - Intermediate
-   - Matriculating or 1st-year undergraduate student
-   - 1st or 2nd year community college student or transfer student
+    - Community college transfer students
+    - 3rd year undergraduate or above