re-enable all target frameworks

Author: antonfirsov

src/ImageSharp.Drawing/ImageSharp.Drawing.csproj

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

src/ImageSharp/ImageSharp.csproj

@@ -10,9 +10,8 @@
     <VersionPrefix Condition="$(packageversion) != ''">$(packageversion)</VersionPrefix>
     <VersionPrefix Condition="$(packageversion) == ''">0.0.1</VersionPrefix>
 
-    <!--<TargetFrameworks>netcoreapp2.1;netstandard1.3;netstandard2.0;net472</TargetFrameworks>-->
-    <TargetFramework>netstandard2.0</TargetFramework>
-      
+    <TargetFrameworks>netcoreapp2.1;netstandard1.3;netstandard2.0;net472</TargetFrameworks>
+
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <AssemblyName>SixLabors.ImageSharp</AssemblyName>

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -2,8 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <!--<TargetFrameworks>netcoreapp2.1;net462;net472</TargetFrameworks>-->
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFrameworks>netcoreapp2.1;net462;net472</TargetFrameworks>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <LangVersion>latest</LangVersion>
     <DebugType Condition="$(codecov) != ''">full</DebugType>