Update 2 NuGet dependencies

Bumps nanoFramework.CoreLibrary from 2.0.0-preview.18 to 2.0.0-preview.20</br>Bumps Nerdbank.GitVersioning from 3.8.118 to 3.9.50</br>
[version update]

### ⚠️ This is an automated update. ⚠️

Author: nfbot

nanoFramework.Runtime.Native.nuspec

@@ -19,7 +19,7 @@
 This package requires a target with nanoFramework.Runtime.Native v$nativeVersion$ (checksum $checksum$).</description>
     <tags>nanoFramework C# csharp netmf netnf </tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.18" />
+      <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.20" />
     </dependencies>
   </metadata>
   <files>

nanoFramework.Runtime.Native/nanoFramework.Runtime.Native.nfproj

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.props" Condition="Exists('..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.props')" />
+  <Import Project="..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.props" Condition="Exists('..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.props')" />
   <PropertyGroup Label="Globals">
     <NanoFrameworkProjectSystemPath>$(MSBuildExtensionsPath)\nanoFramework\v1.0\</NanoFrameworkProjectSystemPath>
   </PropertyGroup>
@@ -59,7 +59,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.18\lib\netnano1.0\mscorlib.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.20\lib\netnano1.0\mscorlib.dll</HintPath>
     </Reference>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />
@@ -72,8 +72,8 @@
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105.The missing file is {0}.</ErrorText>
     </PropertyGroup>
-    <Error Condition="!Exists('..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.props'))" />
-    <Error Condition="!Exists('..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.targets'))" />
+    <Error Condition="!Exists('..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.props'))" />
+    <Error Condition="!Exists('..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.targets'))" />
   </Target>
-  <Import Project="..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.targets" Condition="Exists('..\packages\Nerdbank.GitVersioning.3.8.118\build\Nerdbank.GitVersioning.targets')" />
+  <Import Project="..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.targets" Condition="Exists('..\packages\Nerdbank.GitVersioning.3.9.50\build\Nerdbank.GitVersioning.targets')" />
 </Project>

nanoFramework.Runtime.Native/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.18" targetFramework="netnano1.0" />
-  <package id="Nerdbank.GitVersioning" version="3.8.118" developmentDependency="true" targetFramework="netnano1.0" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.20" targetFramework="netnano1.0" />
+  <package id="Nerdbank.GitVersioning" version="3.9.50" developmentDependency="true" targetFramework="netnano1.0" />
 </packages>

nanoFramework.Runtime.Native/packages.lock.json

@@ -4,15 +4,15 @@
     ".NETnanoFramework,Version=v1.0": {
       "nanoFramework.CoreLibrary": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.18, 2.0.0-preview.18]",
-        "resolved": "2.0.0-preview.18",
-        "contentHash": "zFZ4hHxd8ljFSaG3aVVqMESStR61COYnfzXBYMkmcyfcSJKpMfDG8is5/qBY5PV4XmJ+3A3kJYWbfMNg6n0DCA=="
+        "requested": "[2.0.0-preview.20, 2.0.0-preview.20]",
+        "resolved": "2.0.0-preview.20",
+        "contentHash": "yBjbnxlEOHj8wJf/7ZK+QIUTNW1HZHLwtUW5d6g2vTGgjKu/xrSfvWQHPTCuE1MmXP+WPPT/aJy9k8HuIJmUmA=="
       },
       "Nerdbank.GitVersioning": {
         "type": "Direct",
-        "requested": "[3.8.118, 3.8.118]",
-        "resolved": "3.8.118",
-        "contentHash": "cRaG+ICcECG+CzbtQyUV2WftH7yl2B02AjYGGNScXx8TwYavZYwhCewBTiC0qTcsac7m6AzBUYna5xzBWmTGYw=="
+        "requested": "[3.9.50, 3.9.50]",
+        "resolved": "3.9.50",
+        "contentHash": "HtOgGF6jZ+WYbXnCUCYPT8Y2d6mIJo9ozjK/FINTRsXdm4Zgv9GehUMa7EFoGQkqrMcDJNOIDwCmENnvXg4UbA=="
       }
     }
   }