add int variant to MathHelper.Approach

src/Math/MathHelper.cs

@@ -354,6 +354,19 @@ namespace MoonWorks.Math
         /// <param name="end">End value.</param>
         /// <param name="change">Change value.</param>
         public static float Approach(float start, float end, float change)
+        {
+            return start < end ?
+                System.Math.Min(start + change, end) :
+                System.Math.Max(start - change, end);
+        }
+
+		/// <summary>
+        /// Step from start towards end by change.
+        /// </summary>
+        /// <param name="start">Start value.</param>
+        /// <param name="end">End value.</param>
+        /// <param name="change">Change value.</param>
+		public static int Approach(int start, int end, int change)
 		{
 			return start < end ?
                 System.Math.Min(start + change, end) :