Update to .net core 2.1.1

Author: cnblogs-dudu

src/Cuiliang.AliyunOssSdk.csproj

@@ -12,7 +12,7 @@
     <Folder Include="Properties\" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.1.0" />
-    <PackageReference Include="Microsoft.Extensions.Http" Version="2.1.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="2.1.1" />
   </ItemGroup>  
 </Project>

tests/Sample/Sample.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.0</TargetFramework>
@@ -7,8 +7,8 @@
     <ProjectReference Include="..\..\src\Cuiliang.AliyunOssSdk.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.1.0" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.1.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.1.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.1.1" />
   </ItemGroup>
 </Project>