Revert "Updated framework restrictions in paket.dependencies"

This reverts commit 6323f88.

Author: 1eyewonder

paket.dependencies

@@ -1,6 +1,5 @@
 source https://api.nuget.org/v3/index.json
 
-framework: >= net461, >= netstandard2.0
 storage: none
 content: none
 
@@ -13,7 +12,6 @@ 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