参考
メッセージ
› Warning: heroku update available from 7.39.0 to 7.47.0.
対処
heroku version
----------
› Warning: heroku update available from 7.39.0 to 7.47.0.
heroku/7.39.0 darwin-x64 node-v12.13.0
heroku update
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heroku: Updating CLI from 7.39.0 to 7.47.0... done
› Warning: Our terms of service have changed: https://dashboard.heroku.com/terms-of-service
heroku: Updating CLI... done
Updating completions... done
heroku version
----------
heroku/7.47.0 darwin-x64 node-v12.16.2