Update appveyor.yml

Author: scott-xu

appveyor.yml

@@ -37,7 +37,7 @@ test_script:
   - for /f %%G in ('dir /b /s *.coveragexml') do Codecov\tools\codecov -f "%%G"
 
 artifacts:
-  - path: '**\*.nupkg'
+  - path: 'src\**\*.nupkg'
 
 deploy:
   provider: NuGet