Remove unushed exception in Triangle exercise

exercises/bowling/BowlingTest.cs

@@ -291,7 +291,7 @@ public void Cannot_roll_after_bonus_rolls_for_strike()
         Assert.Throws<ArgumentException>(() => sut.Roll(2));
     }
 
-    public void DoRoll(IEnumerable<int> rolls, BowlingGame sut)
+    private void DoRoll(IEnumerable<int> rolls, BowlingGame sut)
     {
         foreach (var roll in rolls)
         {

exercises/triangle/Example.cs

@@ -11,7 +11,6 @@ public enum TriangleKind
 
 public static class Triangle
 {
-
     public static bool IsScalene(double side1, double side2, double side3)
     {
         return Kind(side1, side2, side3) == TriangleKind.Scalene;
@@ -65,6 +64,4 @@ private static int UniqueSides(double side1, double side2, double side3)
         double[] sides = { side1, side2, side3 };
         return sides.Distinct().Count();
     }
-}
-
-public class TriangleException : Exception { }
+}

exercises/triangle/Triangle.cs

@@ -16,7 +16,4 @@ public static bool IsEquilateral(double side1, double side2, double side3)
     {
         throw new NotImplementedException("You need to implement this function.");
     }
-
-}
-
-public class TriangleException : Exception { }
+}

generators/Exercises/Generators/Bowling.cs

@@ -78,7 +78,7 @@ protected override void UpdateTestClass(TestClass testClass)
         private static void AddDoRollMethod(TestClass testClass)
         {
             testClass.AdditionalMethods.Add(@"
-public void DoRoll(IEnumerable<int> rolls, BowlingGame sut)
+private void DoRoll(IEnumerable<int> rolls, BowlingGame sut)
 {
     foreach (var roll in rolls)
     {