Added error handling of failed speedtests

re issue #143

app/Notifications/SpeedtestFailedTelegram.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+use NotificationChannels\Telegram\TelegramChannel;
+use NotificationChannels\Telegram\TelegramMessage;
+
+class SpeedtestFailedTelegram extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    /**
+     * Create a new notification instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    public function via($notifiable)
+    {
+        return [
+            TelegramChannel::class
+        ];
+    }
+
+    /**
+     * Format tekegram notification
+     *
+     * @param   mixed   $notifiable
+     * @return  TelegramMessage
+     */
+    public function toTelegram($notifiable)
+    {
+        $msg = "Error: something went wrong running your speedtest";
+        return TelegramMessage::create()
+                              ->to(env('TELEGRAM_CHAT_ID'))
+                              ->content($msg)
+                              ->options(['parse_mode' => 'Markdown']);
+    }
+}