New naming convention was introduced in commit [1d21976]. Task YAML files are now called
formulae and key `task:` in task formula was replaced with key `actions:` which better
describes its meaning.
This change means that task formulae with old 'task:' key won't work and will
TaskotronYamlError (unfortunately at this moment this applies to all tasks in our
bitbucket repo, but do not worry, patches will come).