Add WebUrl property to Commit (#127)

Author: ap0llo

src/GitLabApiClient/Models/Commits/Responses/Commit.cs

@@ -32,6 +32,8 @@ public sealed class Commit
         public string Message { get; set; }
         [JsonProperty("parent_ids")]
         public List<string> ParentIds { get; } = new List<string>();
+        [JsonProperty("web_url")]
+        public string WebUrl { get; set; }
 
     }
 }