Fixes in nuget package (#176)

Author: josesimoes

source/TestAdapter/nanoFramework.TestAdapter.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="ICSharpCode.Decompiler" Version="7.2.1.6856" />
     <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="17.3.2" />
     <PackageReference Include="nanoFramework.nanoCLR.Win32" GeneratePathProperty="true">
-      <Version>1.8.0.440</Version>
+      <Version>1.8.0.570</Version>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>

source/package.nuspec

@@ -12,7 +12,6 @@
     <readme>docs\README.md</readme>
     <developmentDependency>true</developmentDependency>
     <projectUrl>https://github.com/nanoFramework.TestFramework</projectUrl>
-    <iconUrl>https://secure.gravatar.com/avatar/97d0e092247f0716db6d4b47b7d1d1ad</iconUrl>
     <icon>images\nf-logo.png</icon>
     <repository type="git" url="https://github.com/nanoFramework.TestFramework" commit="$commit$" />
     <copyright>Copyright (c) .NET Foundation and Contributors</copyright>

source/runsettings/nano.runsettings

@@ -5,7 +5,8 @@
        <MaxCpuCount>1</MaxCpuCount>
        <ResultsDirectory>.\TestResults</ResultsDirectory><!-- Path relative to solution directory -->
        <TestSessionTimeout>120000</TestSessionTimeout><!-- Milliseconds -->
-       <TargetFrameworkVersion>Framework40</TargetFrameworkVersion>
+       <TargetFrameworkVersion>net48</TargetFrameworkVersion>
+       <TargetPlatform>x64</TargetPlatform>
    </RunConfiguration>
    <nanoFrameworkAdapter>
        <Logging>None</Logging>