Missing jq

[nemanjan00]

heroku/heroku-buildpack-nodejs#856

=====> Downloading Buildpack: https://github.com/heroku/heroku-buildpack-nodejs
=====> Detected Framework: Node.js
/tmp/buildpackmBiOP/lib/json.sh: line 5: /usr/bin/jq: Permission denied
/tmp/buildpackmBiOP/lib/json.sh: line 52: /usr/bin/jq: No such file or directory
 !     Unable to parse package.json

[josegonzalez]

Fixed in v0.5.20.