title: AdonisJS no default values for timestamps
body: <p>I have created basic schema with timestamps, but when I insert into table in seeder, column created_at and updated_at are null, but based on the Knex.js documentation I thought it should be current datetime if not specified.</p>
  
  <p>Latest adonis libraries, database: mysql 5.7.</p>
  
  <p>My Schema</p>
  
  <pre><code>'use strict'
  
  const Schema = use('Schema')
  
  class UserSchema extends Schema {
    up () {
      this.create('users', (table) =&gt; {
        table.increments()
        table.string('name')
        table.timestamps()
      })
    }
  
    down () {
      this.drop('users')
    }
  }
  
  module.exports = UserSchema
  </code></pre>
  
  <p>My Seeder</p>
  
  <pre><code>'use strict'
  
  const Factory = use('Factory')
  const Database = use('Database')
  
  class UserSeeder {
    async run () {
      await Database.table('users').insert({
        name: 'JP',
      })
    }
  }
  
  module.exports = UserSeeder
  </code></pre>