Seed task uses log instead of puts

[jkthorne]

This moves to use puts so you can suppress output if you want.

[jwoertink]

I like the idea of being able to suppress the output, but if it's just Log, then you'd have to turn that off globally which might not be wanted. We could look at doing something like LuckyTask::Log.info, then you can tune it for tasks specifically... But really, I think maybe this should actually be output.puts and use the output property on LuckyTask

https://github.com/luckyframework/lucky_task/blob/da2bfd5d69c6aab7e5c4a1e998469645d4b31a63/src/lucky_task/task.cr#L6

Then maybe we add a habitat config for tasks that allow you to just turn off all output. What do you think about going with one of those approaches?