Updated framework restrictions in paket.dependencies

Author: 1eyewonder

paket.dependencies

@@ -1,5 +1,6 @@
 source https://api.nuget.org/v3/index.json
 
+framework: >= net461, >= netstandard2.0
 storage: none
 content: none
 
@@ -12,6 +13,7 @@ nuget Mono.Cecil ~> 0.11.1
 nuget System.Security.Cryptography.ProtectedData >= 4.4
 
 nuget NETStandard.Library ~> 2.0
+nuget System.Net.Http
 nuget System.Net.Http.WinHttpHandler >= 4.5
 nuget Nuget.Packaging
 nuget Microsoft.Win32.Registry