Update target framework to .NET 5 & telegram-bot-framework. Update bot codebase to use the new framework API.

modules/RichSiteSummary/Handler/FeedList.cs

@@ -4,6 +4,8 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using BotFramework.Attributes;
+using BotFramework.Enums;
+using BotFramework.Setup;
 using Kruzya.TelegramBot.Core.Extensions;
 using Kruzya.TelegramBot.RichSiteSummary.Data;
 using Microsoft.EntityFrameworkCore;
@@ -210,7 +212,7 @@ namespace Kruzya.TelegramBot.RichSiteSummary.Handler
 
         #region Message handler
 
-        [CallbackQuery]
+        [Update(InChat.All, UpdateFlag.CallbackQuery)]
         public async Task HandleAction()
         {
             if (!RawUpdate.CallbackQuery.Data.StartsWith("feed|"))

modules/RichSiteSummary/RichSiteSummary.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <TargetFramework>net5.0</TargetFramework>
         <AssemblyName>TelegramBot.RichSiteSummary</AssemblyName>
         <RootNamespace>Kruzya.TelegramBot.RichSiteSummary</RootNamespace>
     </PropertyGroup>