Fix typo in README.md
Merge pull request #7 from sinetris/fix-typo-1

Fix typo in README.md. LMAO. Thanks to @sinetris
add a configuration option to export env vars

Add a way to make heroku config vars available at slug compile time
Update heroku cli command in README

In the Heroku Toolbelt they changed config:add in config:set
Merge pull request #9 from sinetris/update-readme-1

Update Heroku CLI command in README. Thank you @sinetris ~!
local.install => archive.install
Merge pull request #8 from sinetris/export-heroku-vars

add a configuration option to export env vars. Thanks to @sinetris
Use Elixir version 0.15.0 by default