[Feature] Add XLM and add test case for websocket feed (#192)

CoinbasePro.Specs/WebSocket/WebSocketSpecs.cs

@@ -68,6 +68,20 @@ class when_calling_start_and_not_providing_product_types
                     exception.ShouldBeOfExactType<ArgumentException>();
             }
 
+            class when_calling_stop
+            {
+                class before_calling_start
+                {
+                    Because of = () =>
+                        Subject.Stop();
+
+                    It should_not_have_attempted_to_close_the_feed = () =>
+                        The<IWebSocketFeed>().
+                            WasNotToldTo(p =>
+                                p.Close());
+                }
+            }
+
             class when_setting_the_auto_send_ping_interval
             {
                 class when_the_websocket_closes_and_restarts
@@ -252,7 +266,6 @@ class when_response_type_is_heartbeat
                     It should_have_invoked_heartbeat_response = () =>
                         The<IWebSocketFeed>().
                             WasToldTo(p => p.Invoke(Param.IsAny<EventHandler<WebfeedEventArgs<Heartbeat>>>(), Param.IsAny<object>(), Param.IsAny<WebfeedEventArgs<Heartbeat>>()));
-
                 }
 
                 class when_response_type_is_received

CoinbasePro/Services/Products/ProductsService.cs

@@ -95,7 +95,6 @@ public async Task<IList<Candle>> GetHistoricRatesAsync(
                 if (previousBatchEnd == batchEnd) {
                     break;
                 }
-
             } while (batchStart > start);
 
             return candleList;

CoinbasePro/Shared/Types/Currency.cs

@@ -20,6 +20,7 @@ public enum Currency
         USD,
         USDC,
         Unknown,
+        XLM,
         XRP,
         ZEC,
         ZIL,

CoinbasePro/Shared/Types/ProductType.cs

@@ -79,6 +79,12 @@ public enum ProductType
         [EnumMember(Value = "XRP-BTC")]
         XrpBtc,
         [EnumMember(Value = "XRP-USD")]
-        XrpUsd
+        XrpUsd,
+        [EnumMember(Value = "XLM-USD")]
+        XlmUsd,
+        [EnumMember(Value = "XLM-BTC")]
+        XlmBtc,
+        [EnumMember(Value = "XLM-EUR")]
+        XlmEur
     }
 }