Return netcoreapp2.2

Author: phnx47

src/Prometheus.Client.AspNetCore/Prometheus.Client.AspNetCore.csproj

@@ -5,7 +5,7 @@
     <AssemblyTitle>Prometheus.Client.AspNetCore</AssemblyTitle>
     <VersionPrefix>4.0.0</VersionPrefix>
     <Authors>Sergey Kuznetsov</Authors>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netcoreapp2.2;netstandard2.1;netcoreapp3.1</TargetFrameworks>
     <AssemblyName>Prometheus.Client.AspNetCore</AssemblyName>
     <PackageId>Prometheus.Client.AspNetCore</PackageId>
     <PackageTags>prometheus;metrics</PackageTags>
@@ -38,7 +38,7 @@
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'netstandard2.1'">
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'netcoreapp2.2' OR '$(TargetFramework)' == 'netstandard2.1'">
     <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
   </ItemGroup>
 </Project>