* Implicit handlers building extensions generator refactored

* Telegram.Bot package updated

dev/Telegrator.RoslynGenerators/RoslynExtensions/StringBuilderExtensions.cs

@@ -0,0 +1,10 @@
+using System.Text;
+
+namespace Telegrator.RoslynExtensions
+{
+    public static class StringBuilderExtensions
+    {
+        public static StringBuilder AppendTabs(this StringBuilder builder, int count)
+            => builder.Append(new string('\t', count));
+    }
+}