Uncaught TypeError: editor.onDidStopChanging is not a function

[mBread]

Steps to reproduce:

1. With the "Markdown Preview" package installed (which I believe is installed by default)
2. Open a Markdown file
3. Click Packages -> Markdown Preview -> Toggle Preview to display the markdown preview.
4. Click on the markdown preview's tab
5. Click Packages -> Tail -> Toggle...
   Expected: The markdown preview tab stays at the bottom as I edit the markdown file.
   Actual: One of the two errors below are thrown.

Atom: 1.14.2 x64
Electron: 1.3.13
OS: Ubuntu 16.04.1
Thrown From: tail package 0.1.0

Stack Trace 1

Uncaught TypeError: editor.onDidStopChanging is not a function

At /home/martin/.atom/packages/tail/lib/tail.coffee:38

TypeError: editor.onDidStopChanging is not a function
    at Object.toggle (/packages/tail/lib/tail.coffee:38:38)
    at /packages/tail/lib/tail.coffee:15:60)
    at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/app.asar/src/command-registry.js:259:29)
    at CommandRegistry.handleCommandEvent (/app.asar/src/command-registry.js:3:59)
    at CommandRegistry.module.exports.CommandRegistry.dispatch (/app.asar/src/command-registry.js:160:19)
    at AtomEnvironment.module.exports.AtomEnvironment.dispatchApplicationMenuCommand (/app.asar/src/atom-environment.js:1164:28)
    at EventEmitter.outerCallback (/app.asar/src/application-delegate.js:320:25)
    at emitThree (events.js:116:13)
    at EventEmitter.emit (events.js:194:7)

Commands

  2x -0:32.4.0 core:close (atom-pane.pane.active)
     -0:24.6.0 core:save (input.hidden-input)
     -0:17.6.0 tail:toggle (div.markdown-preview.native-key-bindings)

Stack trace 2

Uncaught TypeError: Cannot read property 'dispose' of null

At /home/martin/.atom/packages/tail/lib/tail.coffee:48

TypeError: Cannot read property 'dispose' of null
    at Object.toggle (/home/martin/.atom/packages/tail/lib/tail.coffee:48:30)
    at atom-workspace.<anonymous> (/home/martin/.atom/packages/tail/lib/tail.coffee:15:60)
    at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/opt/atom/resources/app.asar/src/command-registry.js:259:29)
    at CommandRegistry.handleCommandEvent (/opt/atom/resources/app.asar/src/command-registry.js:3:59)
    at CommandRegistry.module.exports.CommandRegistry.dispatch (/opt/atom/resources/app.asar/src/command-registry.js:160:19)
    at AtomEnvironment.module.exports.AtomEnvironment.dispatchApplicationMenuCommand (/opt/atom/resources/app.asar/src/atom-environment.js:1164:28)
    at EventEmitter.outerCallback (/opt/atom/resources/app.asar/src/application-delegate.js:320:25)
    at emitThree (events.js:116:13)
    at EventEmitter.emit (events.js:194:7)

Non-Core Packages

tail 0.1.0