Test nuget specific options in appveyor.yml

appveyor.yml

@@ -6,8 +6,16 @@ image: Visual Studio 2017
 install:
 - git submodule update --init --recursive
 - ps: .\BuildTools\appveyor-install.ps1
+nuget:
+  account_feed: true
+  project_feed: true
+  disable_publish_on_pr: true
 before_build:
 - nuget restore ILSpy.sln
+build:
+  publish_nuget: true
+  publish_nuget_symbols: true
+  include_nuget_references: true
 build_script:
 - msbuild ILSpy.sln /v:minimal /p:ResolveNuGetPackages=false "/logger:%ProgramFiles%\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
 after_build: