[lint addon] Fix use of let
[lint addon] Fix use of let

pabloferz/CodeMirror,nightwing/CodeMirror,hackmdio/CodeMirror,dperetti/CodeMirror,nightwing/CodeMirror,wingify/CodeMirror,wingify/CodeMirror,pabloferz/CodeMirror,dperetti/CodeMirror,hackmdio/CodeMirror,pabloferz/CodeMirror,hackmdio/CodeMirror,nightwing/CodeMirror,wingify/CodeMirror,dperetti/CodeMirror