Update 1 NuGet dependencies

***NO_CI***

tests/nanoFramework.Hosting.UnitTests.nfproj

@@ -50,12 +50,12 @@
       <HintPath>..\packages\nanoFramework.DependencyInjection.1.0.22\lib\nanoFramework.DependencyInjection.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.TestFramework, Version=2.1.60.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.TestFramework.2.1.60\lib\nanoFramework.TestFramework.dll</HintPath>
+    <Reference Include="nanoFramework.TestFramework, Version=2.1.71.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\packages\nanoFramework.TestFramework.2.1.71\lib\nanoFramework.TestFramework.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.UnitTestLauncher, Version=0.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.TestFramework.2.1.60\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
+      <HintPath>..\packages\nanoFramework.TestFramework.2.1.71\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
       <Private>True</Private>
     </Reference>
   </ItemGroup>
@@ -73,11 +73,4 @@
       <ProjectConfigurationsDeclaredAsItems />
     </ProjectCapabilities>
   </ProjectExtensions>
-  <Import Project="..\packages\nanoFramework.TestFramework.2.1.60\build\nanoFramework.TestFramework.targets" Condition="Exists('..\packages\nanoFramework.TestFramework.2.1.60\build\nanoFramework.TestFramework.targets')" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105.The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\packages\nanoFramework.TestFramework.2.1.60\build\nanoFramework.TestFramework.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\nanoFramework.TestFramework.2.1.60\build\nanoFramework.TestFramework.targets'))" />
-  </Target>
 </Project>

tests/packages.config

@@ -2,5 +2,5 @@
 <packages>
   <package id="nanoFramework.CoreLibrary" version="1.14.2" targetFramework="netnano1.0" />
   <package id="nanoFramework.DependencyInjection" version="1.0.22" targetFramework="netnano1.0" />
-  <package id="nanoFramework.TestFramework" version="2.1.60" targetFramework="netnano1.0" developmentDependency="true" />
+  <package id="nanoFramework.TestFramework" version="2.1.71" targetFramework="netnano1.0" developmentDependency="true" />
 </packages>