Updated NuGet CLI

This is not strictly necessary, and isn't used as part of the production build, but does expand options for managing *NuGet* packages locally via the console.

Author: JeremyCaney

packages.config

@@ -26,7 +26,7 @@
   <package id="Microsoft.Net.Compilers" version="3.2.1" targetFramework="net48" developmentDependency="true" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net47" />
   <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net48" />
-  <package id="NuGet.CommandLine" version="4.6.2" targetFramework="net47" developmentDependency="true" />
+  <package id="NuGet.CommandLine" version="5.1.0" targetFramework="net48" developmentDependency="true" />
   <package id="System.ComponentModel.Annotations" version="4.5.0" targetFramework="net48" />
   <package id="System.Data.DataSetExtensions" version="4.5.0" targetFramework="net48" />
   <package id="System.Data.SqlClient" version="4.6.1" targetFramework="net48" />