remove all completely
init

execute a following command;
  lein new heroku-test-0

versions
* Leiningen: 2.3.3
* OpenJDK: 1.7.0_60 64bit
modify .gitignore

execute a following command;
  curl gitignore.io/api/vim >> .gitignore
modify src/heroku_test_0/core.clj

ref. https://devcenter.heroku.com/articles/getting-started-with-clojure#write-your-app
modify project.clj

ref. https://devcenter.heroku.com/articles/getting-started-with-clojure#declare-dependencies-in-project-clj
modify .gitignore to ignore ".env"

ref. https://devcenter.heroku.com/articles/getting-started-with-clojure#declare-dependencies-in-project-clj
create Procfile

ref. https://devcenter.heroku.com/articles/getting-started-with-clojure#declare-dependencies-in-project-clj
remove illegal } in core.clj
fix Procfile (hello.world -> heroku-test-0.core)
add main function
modify README