How to migrate an odoo 11 app to odoo 12 successfully? : <p>What are the steps ? In my case i need to migrate the hotel management app to odoo 12 git. </p>

<p><strong><em><a href="https://github.com/athulvMkRz/vertical-hotel.git" rel="nofollow noreferrer">click here for the git repository of vertical hotel</a></em></strong></p>
