Project has been converted to use CircleCI 2.0, now that 1.0 is
deprecated.

feat: Upgrade to CircleCI 2.0

One can now include `actions` and `fields` in a `chat send` action.
Examples:
* Fields:
```bash
--fields=|--fields |-flds '{"title": "Environment", "value": "snapshot", "short": true}, {"title": "Foo", "value": "bar", "short": true}'
```
* Actions:
```bash
--actions=|--actions |-a '{"type": "button", "style": "primary", "text": "See results", "url": "http://example.com"},{"type": "button", "style": "primary", "text": "See something else", "url": "http://example.com"}'
```
Provided values must be valid, comma-separated JSON objects.

feat: add actions and fields to chat send

The topic of any public or private channel can now be set using the
`channel settopic` command.

Example:
```bash
$ slack channel settopic 'Awesome topic' '#general'
```

feat: ability to set channel topic