docs(testimonials): add ErmesHotels (#8787)

docs/whos-using.md

@@ -19,3 +19,9 @@
 [![Bitovi Logo](asset/bitovi-logo.png)](https://bitovi.com)
 [![Bitovi Logo](asset/bitovi-logo.png)](https://bitovi.com)
 
 
 > We have used Sequelize in enterprise projects for some of our Fortune 100 and Fortune 500 clients.  It is used in deployments that are depended on by hundreds of millions of devices every year.
 > We have used Sequelize in enterprise projects for some of our Fortune 100 and Fortune 500 clients.  It is used in deployments that are depended on by hundreds of millions of devices every year.
+
+<hr />
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+[![ErmesHotels Logo](asset/ermeshotels-logo.png)](https://ermeshotels.com)
+
+> Using Sequelize in production for two different apps with 30k+ daily users by 2 years. I doubt there is something better at this moment in terms of productivity and features.