This PR upgrades Ghost to v4 and to the latest 4.9.x version.
If you want to use it check out my fork.
Heroku-Deploy now works when clicking it on my fork with version 4.x (as it should).
Feel free to add PRs and bugs to that fork.
My now officially forked version in my repository for 4.x: https://github.com/intra-sh/ghost-on-heroku
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This PR upgrades Ghost to v4 and to the latest 4.9.x version.
If you want to use it check out my fork. Heroku-Deploy now works when clicking it on my fork with version 4.x (as it should). Feel free to add PRs and bugs to that fork. My now officially forked version in my repository for 4.x: https://github.com/intra-sh/ghost-on-heroku