Feature: Log highlight option

[darkpixel]

I would love to see an option to highlight items in the log while displaying them in realtime.

Maybe something like pms logs all --highlight "somestr"

Or even an option you can hit while viewing logs to enter a highlight string sorta like how multitail allows you to hit '?' and put in a string.

[Unitech]

Interesting idea! It is pretty straightforward to implement there: https://github.com/Unitech/pm2/blob/development/lib/API/Log.js#L118