update to .NET Core 2.1

fix bower repo deprecation

Plugins/IW4ScriptCommands/IW4ScriptCommands.csproj

@@ -1,8 +1,8 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
     <ApplicationIcon />
     <StartupObject />
   </PropertyGroup>
@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Update="Microsoft.NETCore.App" Version="2.0.7" />
+    <PackageReference Update="Microsoft.NETCore.App"/>
   </ItemGroup>
 
 </Project>