[ember-moment] attempted to set timezone, but moment-timezone is not setup.

I'm getting `[ember-moment] attempted to set timezone, but moment-timezone is not setup.` and I've read through the other issues in this repo and tried everything with no luck.

```
$ ember -v

ember-cli: 2.18.2
node: 10.14.2
```

```
$ bower list

├── moment#2.24.0
├─┬ moment-timezone#0.5.25
│ └── moment#2.24.0
```

```
// environment.js

module.exports = function(environment) {
let ENV = {
// ...
moment: {
includeTimezone: 'all'
}
};
return ENV;
};
```

Nothing related to moment in `ember-cli-build.js`.

Any ideas? Thanks!

Start by reading the reported environment.js configuration and checking ember-cli-build.js, then reproduce the error with the listed Ember CLI, Node, Bower, moment, and moment-timezone versions. Determine whether the timezone setup is recognized; done means documenting a confirmed cause and the required change or a minimal reproduction.

Written by the indexing model from the issue text.