Merge pull request #657 from dotnet/retarget31

Retarget the nbgv tool against netcoreapp3.1 now that netcoreapp2.1 is out of service

Author: AArnott

azure-pipelines.yml

@@ -18,8 +18,6 @@ resources:
     image: mcr.microsoft.com/dotnet/core/sdk:3.1-bionic
   - container: focal
     image: mcr.microsoft.com/dotnet/core/sdk:3.1-focal
-  - container: disco-3.0
-    image: mcr.microsoft.com/dotnet/core/sdk:3.0-disco
   - container: archlinux
     image: andrewarnott/archlinux
 
@@ -274,8 +272,6 @@ stages:
           containerImage: bionic
         Ubuntu_Focal:
           containerImage: focal
-        Ubuntu_Disco_3_0:
-          containerImage: disco-3.0
         # Arch_Linux:
         #   containerImage: archlinux
         #   configureContainerCommand: 'sudo pacman -Sy --noconfirm git dotnet-sdk openssl-1.0'

src/nbgv/nbgv.csproj

@@ -4,7 +4,7 @@
     <ToolCommandName>nbgv</ToolCommandName>
     <PackAsTool>True</PackAsTool>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <RootNamespace>Nerdbank.GitVersioning.Tool</RootNamespace>
     <Description>A .NET Core Tool that can install, read and set version information based on git history, using Nerdbank.GitVersioning.</Description>
   </PropertyGroup>