Also generating " in msg.ToHtml()

Author: wiz0u

src/Telegram.Bot/Extensions/FormatExtensions.cs

@@ -184,6 +184,7 @@ public static string ToHtml(string message, MessageEntity[]? entities)
                 case '&': sb.Insert(i + 1, "amp;"); i += 4; break;
                 case '<': sb.Insert(i, "&lt"); sb[i += 3] = ';'; break;
                 case '>': sb.Insert(i, "&gt"); sb[i += 3] = ';'; break;
+                case '"': sb.Insert(i, "&quot"); sb[i += 5] = ';'; break;
             }
         }
         return sb.ToString();