更新Microsoft.Extensions.Http到3.1.2，解决IOAuthClient多次注册的问题

Author: xljiulang

WebApiClientCore.Extensions.OAuths/WebApiClientCore.Extensions.OAuths.csproj

@@ -8,9 +8,9 @@
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Sign.snk</AssemblyOriginatorKeyFile>
 
-    <Version>1.0.5</Version>
+    <Version>1.0.5.1</Version>
     <Authors>laojiu</Authors>
-    <Company>laojiu</Company> 
+    <Company>laojiu</Company>
     <Copyright>Copyright © laojiu 2017-2020</Copyright>
     <Description>基于WebApiClientCore的token提供者</Description>
     <Summary>基于WebApiClientCore的token提供者</Summary>
@@ -19,10 +19,11 @@
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://github.com/dotnetcore/WebApiClient</PackageProjectUrl>
-    <PackageIcon>icon.png</PackageIcon> 
+    <PackageIcon>icon.png</PackageIcon>
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Http" Version="3.1.2" />
     <ProjectReference Include="..\WebApiClientCore\WebApiClientCore.csproj" />
   </ItemGroup>
   <ItemGroup>