Update SublimeLinter.sublime-settings

The Airbnb guide states: "Strings longer than 80 characters should be written across multiple lines using string concatenation."

I propose to add the maxlen option to enforce this rule: http://www.jshint.com/docs/options/#maxlen

However maxlen enforces the entire source code, not just a line of String. I would like to hear your thoughts on whether that is a beneficial enforcement to keep JS code at a set width.