Laravel Nothing to Migrate (Migration to PostgreSQL)

I tried to do database migration to postgreSQL but when i run php artisan migrate it giving "nothing to migrate" response, what should i do

here's my code for migration :

<?php

Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     *Run the migrations.
     *
     * @return void
     */
    public function up()
    {
    Schema::create('users', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        $table->string('email',50)->unique();
        $table->string('password');
        $table->rememberToken();
        $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
     public function down()
     {
        Schema::dropIfExists('users');
     }
}