Fixed washing machine reservation, creation, edit and deletion

skolehjem/database/migrations/2020_06_08_085447_create_washing_reservations.php

@@ -17,6 +17,8 @@ class CreateWashingReservations extends Migration
             $table->id();
             $table->timestamp("time");
             $table->timestamps();
+            $table->unsignedBigInteger('machine');
+            $table->foreign("machine")->references('id')->on('washing_machines');
         });
     }