Add 2017.4.29f1 2018.4.3f1 2019.1.8f1

cat ci-generator/unity_versions.yml >> ci-generator/unity_versions.old.yml
echo "" > ci-generator/unity_versions.yml
docker-compose run --rm generate
vim ci-generator/unity_versions.yml

fix 2017 version by adding this:

  platforms:
    mac:
      components: Unity,Mac
    windows:
      components: Unity,Windows

docker-compose run --rm update

🎉

edit: oups, 2017.4.29f1 will probably fail due to #40 I forgot about that.