Support snupkg nuget package

Author: moh-hassan

appveyor.yml

@@ -1,12 +1,12 @@
 #version should be only changed with RELEASE eminent, see RELEASE.md
 
-version: 2.8.0-beta-{build}
+version: 2.8.0-ci-{build}
 
 image: Visual Studio 2019
 
 clone_depth: 1
 pull_requests:
-  do_not_increment_build_number: true
+  do_not_increment_build_number: false
 
 init:
   - ps: |

src/CommandLine/CommandLine.csproj

@@ -26,7 +26,7 @@
 		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
 		<LangVersion>8.0</LangVersion>
 		<IncludeSymbols>true</IncludeSymbols>
-		<DebugType>portable</DebugType>
+		<SymbolPackageFormat>snupkg</SymbolPackageFormat>
 	</PropertyGroup>
 
 	<ItemGroup Condition="'$(BuildTarget)' != 'fsharp'">