Workspace.on is deprecated.

[rochacbruno]

Use Workspace::onDidAddTextEditor or Workspace::observeTextEditors instead.

Workspace.on (/usr/share/atom/resources/app.asar/src/workspace.js:995:11)
Workspace.subscribeWith (/usr/share/atom/resources/app.asar/node_modules/emissary/lib/subscriber.js:28:32)
Workspace.subscribe (/usr/share/atom/resources/app.asar/node_modules/emissary/lib/subscriber.js:63:21)
Workspace.eachEditor (/usr/share/atom/resources/app.asar/src/workspace.js:971:19)
<unknown> (/home/rochacbruno/.atom/packages/flake8/lib/flake8.coffee:120:23)
Config.observeKeyPath (/usr/share/atom/resources/app.asar/src/config.js:555:7)