Heroku button failing deploy

[kanehooper]

Hi team,

The Heroku deploy button within the Readme is no longer working. It is attempting to deploy Ruby 2.5.x to Heroku-20 which is no longer a supported version.

[javoor1]

I have the same problem.

[Matho]

Hi @javoor1

This issue was mentioned also here refinery/refinerycms#3508 (comment)