Work CI-CD

- Update project file.

***NO_CI***

Author: josesimoes

nanoFramework.Graphics/nanoFramework.Graphics.nfproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\packages\Nerdbank.GitVersioning.3.5.113\build\Nerdbank.GitVersioning.props" Condition="Exists('..\packages\Nerdbank.GitVersioning.3.5.113\build\Nerdbank.GitVersioning.props')" />
   <PropertyGroup Label="Globals">
     <NanoFrameworkProjectSystemPath>$(MSBuildExtensionsPath)\nanoFramework\v1.0\</NanoFrameworkProjectSystemPath>
@@ -157,25 +157,20 @@
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
-    <Reference Include="mscorlib, Version=1.12.0.4, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+    <Reference Include="mscorlib">
       <HintPath>..\packages\nanoFramework.CoreLibrary.1.12.0\lib\mscorlib.dll</HintPath>
-      <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.ResourceManager, Version=1.2.5.12968, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+    <Reference Include="nanoFramework.ResourceManager">
       <HintPath>..\packages\nanoFramework.ResourceManager.1.2.5\lib\nanoFramework.ResourceManager.dll</HintPath>
-      <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.Runtime.Events, Version=1.10.0.3, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+    <Reference Include="nanoFramework.Runtime.Events">
       <HintPath>..\packages\nanoFramework.Runtime.Events.1.10.0\lib\nanoFramework.Runtime.Events.dll</HintPath>
-      <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.Runtime.Native, Version=1.5.4.3, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+    <Reference Include="nanoFramework.Runtime.Native">
       <HintPath>..\packages\nanoFramework.Runtime.Native.1.5.4\lib\nanoFramework.Runtime.Native.dll</HintPath>
-      <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.System.Collections, Version=1.4.0.3, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+    <Reference Include="nanoFramework.System.Collections">
       <HintPath>..\packages\nanoFramework.System.Collections.1.4.0\lib\nanoFramework.System.Collections.dll</HintPath>
-      <Private>True</Private>
     </Reference>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />