updates read me
dummy commit
try to fix a heroku/tire issue, https://devcenter.heroku.com/articles/rails-asset-pipeline#troubleshooting
try with  heroku labs:enable user-env-compile.
Reverts "try to fix a heroku/tire issue, https://devcenter.heroku.com/articles/rails-asset-pipeline#troubleshooting"

This reverts commit c4fa61e7b2e350c678bd96ba3da2937ec97bbeda.