chore: update Prometheus.Client

Author: phnx47

src/Prometheus.Client.DependencyInjection/Prometheus.Client.DependencyInjection.csproj

@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp2.2;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
     <Copyright>2020 © Serge K, Oleksandr Poliakov</Copyright>
     <AssemblyTitle>Prometheus.Client.DependencyInjection</AssemblyTitle>
-    <VersionPrefix>0.3.0</VersionPrefix>
+    <VersionPrefix>0.4.0</VersionPrefix>
     <Authors>Serge K, Oleksandr Poliakov</Authors>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>../../Prometheus.Client.DependencyInjection.snk</AssemblyOriginatorKeyFile>
@@ -28,6 +28,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="3.1.11" />
-    <PackageReference Include="Prometheus.Client" Version="4.2.0" />
+    <PackageReference Include="Prometheus.Client" Version="4.3.0" />
   </ItemGroup>
 </Project>

src/Prometheus.Client.DependencyInjection/ServiceCollectionExtensions.cs

@@ -1,7 +1,5 @@
 using Microsoft.Extensions.DependencyInjection;
-using Prometheus.Client.Abstractions;
 using Prometheus.Client.Collectors;
-using Prometheus.Client.Collectors.Abstractions;
 
 namespace Prometheus.Client.DependencyInjection
 {