update sharesnumber to double (#119)

Author: Matthiee

FinancialModelingPrepApi/Model/Fund/ETFStockExposureResponse.cs

@@ -11,7 +11,7 @@ public class ETFStockExposureResponse
         public string AssetExposure { get; set; }
 
         [JsonPropertyName("sharesNumber")]
-        public int SharesNumber { get; set; }
+        public double SharesNumber { get; set; }
 
         [JsonPropertyName("weightPercentage")]
         public double WeightPercentage { get; set; }