Added error handling of failed speedtests

re issue #143

database/migrations/2020_07_03_095049_update_speedtest_add_failed_column.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class UpdateSpeedtestAddFailedColumn extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('speedtests', function($table) {
+            $table->boolean('failed')->default(false);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('speedtests', function($table) {
+            $table->dropColumn('failed');
+        });
+    }
+}