Fixed error in lsn4School that prevented earlier exercises from compiling.

Author: jimflores5

src/org/launchcode/java/demos/lsn4school/Student.java

@@ -28,10 +28,10 @@ public String studentInfo() {
         return (this.name + " has a GPA of: " + this.gpa);
     }
 
-    // TODO: Complete the getGradeLevel method here:
-    public String getGradeLevel() {
-        // Determine the grade level of the student based on numberOfCredits
-    }
+    // TODO: Uncomment and complete the getGradeLevel method here:
+//    public String getGradeLevel() {
+//        // Determine the grade level of the student based on numberOfCredits
+//    }
 
     // TODO: Complete the addGrade method.
     public void addGrade(int courseCredits, double grade) {