Only fetch line info if a new debug config option is true (false by default)

[balupton]

Update catepillar-human to use debug property.

This will be a major breaking change. As instead of just doing .setConfig({level: 7}) if they want debugging, they must now also do .setConfig({debug: true, level: 7}).

So will need to have to do something for this... Perhaps something like:

const config = this.getConfig()
const debug = config.debug != null ? config.debug : config.level === 7

However, if we specify a default like false, then the above won't work.

Maybe just gotta break b/c compat.

Would also be interesting to see the performance comparison of this.

[balupton]

I suspect this would be a huge performance increase when not in debug mode. As fetching those lines is quite intensive if doing thousands of logs a minute.

[balupton]

This has been resolved in the upcoming v6