Updating LuckyTask broke Gen::Task

[jwoertink]

In luckyframework/lucky_task#10 we had the issue of people wanting to use --name as an arg, but you couldn't because LuckyTask used it. So I renamed it to task_name thinking "yeah, no one will use that"

... except us 🤦‍♂️

lucky/tasks/gen/task.cr

Line 21 in ecb57b1

positional_arg :task_name, "The name of the task to generate"

so now this doesn't work 😩

I can either revert that change on LuckyTask... or I guess use something other than task_name, or I just rename this one here which kind of becomes a breaking task, though I have a feeling it's not widely used..

[jwoertink]

This was actually fixed in luckyframework/lucky_task#25 LuckyTask now uses class methods to avoid collisions with instances.