[javascript-lint addon] Add comment noting dependency
[javascript-lint addon] Add comment noting dependency

Added note on dependency on jshint.js
wingify/CodeMirror,hackmdio/CodeMirror,pabloferz/CodeMirror,dperetti/CodeMirror,nightwing/CodeMirror,pabloferz/CodeMirror,pabloferz/CodeMirror,dperetti/CodeMirror,nightwing/CodeMirror,nightwing/CodeMirror,dperetti/CodeMirror,hackmdio/CodeMirror,wingify/CodeMirror,hackmdio/CodeMirror,wingify/CodeMirror