Add .Net 5 (#51)

Author: ferhatelmas

src/stream-net/stream-net.csproj

@@ -3,7 +3,7 @@
     <DefineConstants>TRACE;DEBUG;NETCORE</DefineConstants>
   </PropertyGroup>
   <PropertyGroup>
-    <TargetFrameworks>net45;net461;netcoreapp2.1;netcoreapp3.1;netstandard1.6;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net45;net461;netcoreapp2.1;netcoreapp3.1;net5.0;netstandard1.6;netstandard2.0</TargetFrameworks>
   </PropertyGroup>
   <PropertyGroup>
     <PackageId>stream-net</PackageId>