Allow MR Comment Range type to be nullable (#625)

Allow Comment Range type to be nullable

Author: mlemieuxlafontaine-ubi

NGitLab/Models/Range.cs

@@ -8,5 +8,5 @@ public class Range
     public string LineCode { get; set; }
 
     [JsonPropertyName("type")]
-    public DynamicEnum<RangeType> Type { get; set; }
+    public DynamicEnum<RangeType>? Type { get; set; }
 }

NGitLab/PublicAPI.Unshipped.txt

@@ -3050,7 +3050,7 @@ NGitLab.Models.Range
 NGitLab.Models.Range.LineCode.get -> string
 NGitLab.Models.Range.LineCode.set -> void
 NGitLab.Models.Range.Range() -> void
-NGitLab.Models.Range.Type.get -> NGitLab.DynamicEnum<NGitLab.Models.RangeType>
+NGitLab.Models.Range.Type.get -> NGitLab.DynamicEnum<NGitLab.Models.RangeType>?
 NGitLab.Models.Range.Type.set -> void
 NGitLab.Models.RangeType
 NGitLab.Models.RangeType.New = 0 -> NGitLab.Models.RangeType