Update to 2.2.300 of the SDK

This has better dotnet test functionality.

azure-pipelines/build.yml

@@ -1,9 +1,9 @@
 steps:
-- task: DotNetCoreInstaller@0
-  displayName: Install .NET Core SDK 2.2.104
+- task: UseDotNet@2
+  displayName: Install .NET Core SDK 2.2.300
   inputs:
     packageType: sdk
-    version: 2.2.104
+    version: 2.2.300
 - script: dotnet --info
   displayName: Show dotnet SDK info
 

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    // Get the pinned version of the SDK from https://dotnet.microsoft.com/download/dotnet-core/2.1
-    "version": "2.2.104"
+    // Get the pinned version of the SDK from https://dotnet.microsoft.com/download/dotnet-core/2.2
+    "version": "2.2.300"
   }
 }

tests/MessagePack.Tests/MessagePack.Tests.csproj

@@ -2,7 +2,6 @@
   <PropertyGroup>
     <TargetFrameworks>net461;net47;netcoreapp1.0;netcoreapp2.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <IsTestProject>true</IsTestProject>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
     <NoWarn>$(NoWarn);CS1701</NoWarn>