Merge branch 'master' into update-autofac

Author: Jan Nils Ferner

CompositionRoot/CompositionRoot.csproj

@@ -6,7 +6,7 @@
         <RootNamespace>Messerli.CompositionRoot</RootNamespace>
     </PropertyGroup>
     <PropertyGroup>
-        <TargetFramework>netstandard2.1</TargetFramework>
+        <TargetFrameworks>netstandard2.1;netstandard2.0</TargetFrameworks>
         <LangVersion>8.0</LangVersion>
         <Nullable>enable</Nullable>
         <TreatWarningsAsErrors>true</TreatWarningsAsErrors>