A fix that prevents normal sampler returning values outside of min max (#258)

com.unity.perception/CHANGELOG.md

 
 ### Fixed
 
+A bug in the Normal Sampler where it would return values less than the passed in min, or greater than the passed in max, for random values very close to 0 or 1 respectively.
+
 ## [0.8.0-preview.2] - 2021-03-15
 
 ### Upgrade Notes

com.unity.perception/Runtime/Randomization/Samplers/SamplerUtility.cs

                 return min;
 
             var stdTruncNorm = NormalCdfInverse(c);
-            return stdTruncNorm * stdDev + mean;
+            return math.clamp(stdTruncNorm * stdDev + mean, min, max);
         }
 
         /// <summary>