Remove let in code that should be ES5
Remove let in code that should be ES5

jkaplon/CodeMirror,codio/CodeMirror,namin/CodeMirror,MarcelGerber/CodeMirror,dperetti/CodeMirror,jayaprabhakar/CodeMirror,notepadqq/CodeMirror,wingify/CodeMirror,namin/CodeMirror,nightwing/CodeMirror,nightwing/CodeMirror,thomasjm/CodeMirror,mtaran-google/CodeMirror,SidPresse/CodeMirror,ficristo/CodeMirror,notepadqq/CodeMirror,ficristo/CodeMirror,jayaprabhakar/CodeMirror,jayaprabhakar/CodeMirror,dperetti/CodeMirror,pabloferz/CodeMirror,hackmdio/CodeMirror,MarcelGerber/CodeMirror,SidPresse/CodeMirror,hackmdio/CodeMirror,codio/CodeMirror,namin/CodeMirror,MarcelGerber/CodeMirror,dperetti/CodeMirror,wingify/CodeMirror,wingify/CodeMirror,SidPresse/CodeMirror,jkaplon/CodeMirror,nightwing/CodeMirror,thomasjm/CodeMirror,notepadqq/CodeMirror,codio/CodeMirror,thomasjm/CodeMirror,mtaran-google/CodeMirror,pabloferz/CodeMirror,hackmdio/CodeMirror,ficristo/CodeMirror,jkaplon/CodeMirror,mtaran-google/CodeMirror,pabloferz/CodeMirror