Upgrade dependencies and target frameworks

.travis.yml

@@ -2,26 +2,20 @@ language: csharp
 
 os:
  - linux
- - osx
 
 dist: bionic
-osx_image: xcode9.1
-
 mono: none
-dotnet: 2.2.300
+dotnet: 3.0.100
 
-before_install:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then ulimit -n 2048; fi
 install:
-  - dotnet tool install -g dotnet-format --version 4.0.40103 --add-source https://dotnet.myget.org/F/format/api/v3/index.json
+  - dotnet tool install -g dotnet-format
   - export PATH="$PATH:$HOME/.dotnet/tools"
   - dotnet-format --version
-before_script:
+script:
   - echo "Checking format..." 
   - dotnet format --check --dry-run -w src/neo-vm -v diagnostic         # check C# formatting for the source
   - dotnet format --check --dry-run -w tests/neo-vm.Tests -v diagnostic # check C# formatting for the unit tests
   - cd tests/neo-vm.Tests
-script:
   - dotnet restore
   - find * -name *.csproj | xargs -I % dotnet add % package coverlet.msbuild
   - dotnet test /p:CollectCoverage=true /p:CoverletOutputFormat=opencover

src/neo-vm/neo-vm.csproj

@@ -1,29 +1,22 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Copyright>2016-2019 The Neo Project</Copyright>
     <AssemblyTitle>Neo.VM</AssemblyTitle>
     <Description>Neo.VM</Description>
     <Version>3.0.0-preview1</Version>
     <Authors>The Neo Project</Authors>
-    <TargetFrameworks>netstandard1.6;net461</TargetFrameworks>
+    <TargetFramework>netstandard2.1</TargetFramework>
     <AssemblyName>Neo.VM</AssemblyName>
     <PackageId>Neo.VM</PackageId>
     <PackageTags>NEO;AntShares;Blockchain;Smart Contract;VM</PackageTags>
     <PackageProjectUrl>https://github.com/neo-project/neo-vm</PackageProjectUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/neo-project/neo-vm.git</RepositoryUrl>
-    <NetStandardImplicitPackageVersion Condition=" '$(TargetFramework)' == 'netstandard1.6' ">1.6.0</NetStandardImplicitPackageVersion>
     <RootNamespace>Neo.VM</RootNamespace>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
-    <Reference Include="System.Numerics" />
-    <Reference Include="System" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-
 </Project>

tests/neo-vm.Tests/neo-vm.Tests.csproj

@@ -1,16 +1,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
     <RootNamespace>Neo.Test</RootNamespace>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
-    <PackageReference Include="MSTest.TestAdapter" Version="1.4.0" />
-    <PackageReference Include="MSTest.TestFramework" Version="1.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.3.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />
   </ItemGroup>
 
   <ItemGroup>