Fixing nuget in new Logging.Serial (#31)

Author: Ellerbach

nanoFramework.Logging.Serial.nuspec

@@ -26,8 +26,7 @@ There is also a package with the Stream Logging only and another with the basic
       <dependency id="nanoFramework.CoreLibrary" version="1.10.5-alpha.145.6" />
       <dependency id="nanoFramework.Runtime.Events" version="1.9.0-preview.26" />
       <dependency id="nanoFramework.System.Text" version="1.1.1-preview.51" />
-      <dependency id="nanoFramework.Windows.Devices.SerialCommunication" version="1.3.4-preview.94" />
-      <dependency id="nanoFramework.Windows.Storage.Streams" version="1.12.2-preview.5" />
+      <dependency id="nanoFramework.System.IO.Ports" version="1.0.0-preview.19" />
       <dependency id="nanoFramework.Logging" version="$version$" />
     </dependencies>
   </metadata>