Heroku deploy fails

[ugiordan]

Describe the bug The app does not deploy on Heroku and fails with the following error:

Some possible problems:
   
   - Dangerous semver range (>) in engines.node
     https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version

To Reproduce Just follow the step-by-step Try it now with Heroku guide.

Desktop (please complete the following information):

• OS: iOS
• Browser: safari