travis-ci/travis-build — pull request #183 by roidrage (2013-12-09 13:05:06+00:00)
Title: Accepts addons specified as list.

Some folks specify a list in their addons section, causing a nasty
error message to show up in the build logs. This change accepts
both a hash and a list.

Both of these will work:

```
addons:
- firefox: 19
```
and

```
addons:
firefox: 19
```