update: Add Maintainer Guestbook entries

[Related PR](open-sauced#200)

    This commit adds two new entries to the Maintainer Guestbook:

    - Virtual Coffee by VirtualCoffee
    - Postpartum Wellness App by BekahHW

docs/becoming-a-maintainer/translations/es/libro-de-visitas-de-mantenedores.md

@@ -8,3 +8,6 @@ Felicidades por terminar el curso de Conviértete en Mantenedor con OpenSauced.
 <!--
 - [project name](link to your repository) by [GitHub username](link to your GitHub profile)
 --> 
+
+- [Virtual Coffee](https://github.com/virtual-Coffee/virtualcoffee.io/) de [VirtualCoffee](https://github.com/virtual-Coffee/)
+- [Postpartum Wellness App](https://github.com/BekahHW/postpartum-wellness-app) de [BekahHW](https://github.com/BekahHW/)