Revert "hack dev inner loop as usual"

This reverts commit 907df3e.

Author: antonfirsov

src/ImageSharp.Drawing/ImageSharp.Drawing.csproj

@@ -9,8 +9,7 @@
     <PackageTags>Image Draw Shape Path Font</PackageTags>
     <RootNamespace>SixLabors.ImageSharp.Drawing</RootNamespace>
 
-<!--    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;netstandard2.1;netstandard2.0;netstandard1.3;net472</TargetFrameworks>-->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;netstandard2.1;netstandard2.0;netstandard1.3;net472</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

tests/ImageSharp.Drawing.Benchmarks/ImageSharp.Drawing.Benchmarks.csproj

@@ -3,8 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <RootNamespace>SixLabors.ImageSharp.Drawing.Benchmarks</RootNamespace>
-<!--    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>-->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <GenerateProgramFile>false</GenerateProgramFile>
     <!--Used to hide test project from dotnet test-->

tests/ImageSharp.Drawing.Tests/ImageSharp.Drawing.Tests.csproj

@@ -2,8 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-<!--    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>-->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <LangVersion>latest</LangVersion>
     <DebugSymbols>True</DebugSymbols>