Add a information on the jump that is a special jump

Add the "update" feature on the jump.

Back/skydiveLogs-api/DataContract/JumpReq.cs

@@ -23,5 +23,7 @@ namespace skydiveLogs_api.DataContract
         public string Notes { get; set; }
 
         public DateTime JumpDate { get; set; }
+
+        public bool IsSpecial { get; set; }
     }
-}
+}

Back/skydiveLogs-api/DataContract/JumpResp.cs

@@ -23,5 +23,7 @@ namespace skydiveLogs_api.DataContract
         public string Notes { get; set; }
 
         public DateTime JumpDate { get; set; }
+
+        public bool IsSpecial { get; set; }
     }
 }