leandro@leandro-VirtualBox:~$ git push origin master
Counting objects: 8772, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (5936/5936), done.
Writing objects: 100% (8772/8772), 231.85 MiB | 1.11 MiB/s, done.
Total 8772 (delta 3188), reused 7548 (delta 2718)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> App not compatible with buildpack: https://github.com/heroku/heroku-buildpack-ruby.git
remote:        More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !	Push rejected to desolate-waters-43898.
remote:
To https://git.heroku.com/desolate-waters-43898.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/desolate-waters-43898.git'