fix appveyor.yml

Author: seayxu

appveyor.yml

@@ -19,7 +19,7 @@ build:
 test: off
 artifacts:
 - path: test\GodSharp.SerialPort.ConsoleSample\bin\$(configuration)\
-  name: GodSharp.SerialPort.ConsoleSample-v$(appveyor_build_version).zip
+  name: GodSharp.SerialPort.ConsoleSample-v$(appveyor_build_version)
 deploy:
 - provider: NuGet
   server: https://www.nuget.org/api/v2/package