Update debug

[bitdivine]

I note that the version of debug that always-tail relies on has a minor vulnerability filed against it. Can you update the dependency please?

Here is the audit message. The formatting is not perfect but is readable:

` │ Low │ Regular Expression Denial of Service │

│ Package │ debug │

│ Patched in │ >= 2.6.9 < 3.0.0 || >= 3.1.0 │

│ Dependency of │ always-tail │

│ Path │ always-tail > debug │

│ More info │ https://nodesecurity.io/advisories/534 │ `