Added ssl stream dispose call on client dispose method

Author: Ahmad Noman Musleh

src/OpenAPI.Net/OpenAPI.Net.csproj

@@ -9,7 +9,7 @@
     <PackageTags>cTrader, Open API, Spotware</PackageTags>
     <Description>A .NET RX library for Spotware Open API</Description>
     <PackageId>Spotware.OpenAPI.Net</PackageId>
-    <Version>1.3.7-rc3</Version>
+    <Version>1.3.7-rc4</Version>
     <Platforms>AnyCPU</Platforms>
     <Company>Spotware</Company>
     <Authors>Spotware</Authors>

src/OpenAPI.Net/OpenClient.cs

@@ -284,6 +284,7 @@ public void Dispose()
             }
             else
             {
+                _sslStream?.Dispose();
                 _tcpClient?.Dispose();
             }