[SL.Core] Cross target .NETCOREAPP2.1

src/SixLabors.Core/MathF.cs

@@ -3,7 +3,7 @@
 
 using System.Runtime.CompilerServices;
 
-#if NETCOREAPP2_0
+#if NETCOREAPP2_0 || NETCOREAPP2_1
 [assembly: TypeForwardedTo(typeof(System.MathF))]
 #else
 namespace System

src/SixLabors.Core/SixLabors.Core.csproj

@@ -5,7 +5,7 @@
         <VersionPrefix Condition="$(packageversion) != ''">$(packageversion)</VersionPrefix>
         <VersionPrefix Condition="$(packageversion) == ''">0.1.0-alpha2</VersionPrefix>
         <Authors>Six Labors</Authors>
-        <TargetFrameworks>netstandard1.1;netcoreapp2.0;</TargetFrameworks>
+        <TargetFrameworks>netstandard1.1;netcoreapp2.0;netcoreapp2.1;</TargetFrameworks>
         <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
         <AssemblyName>SixLabors.Core</AssemblyName>
@@ -39,13 +39,18 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="StyleCop.Analyzers" Version="1.1.0-beta004">
-            <PrivateAssets>All</PrivateAssets>
-        </PackageReference>
+      <PackageReference Include="StyleCop.Analyzers" Version="1.1.0-beta004">
+        <PrivateAssets>All</PrivateAssets>
+      </PackageReference>
+    
+       <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.1" />
+    </ItemGroup>  
+
+    <ItemGroup Condition=" '$(TargetFramework)' != 'netcoreapp2.1'">
         <PackageReference Include="System.Buffers" Version="4.5.0" />
         <PackageReference Include="System.Memory" Version="4.5.1" />
-        <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.5.1" />
     </ItemGroup>
+  
     <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.1'">
         <PackageReference Include="System.Numerics.Vectors" Version="4.4.0" />
     </ItemGroup>