Merge pull request #108 from pearl-core/shellcheck

Add Shellcheck and poetry

Merge pull request #102 from pearl-core/fix-verify-deps

Fix verify deps

Merge pull request #101 from pearl-core/add-to-path

Add `add_to_path` function

Merge pull request #100 from pearl-core/deps-tree

Deps tree

Fix lint

Give more detail in README about package.conf

Update version

Improve closure dep tree calculation