Somehow travis installed queue classic 0.3.2. 0.3.2 causes the following
error:

```
1) Error:
AdapterTest#test_perform_job_logging:
URI::InvalidURIError: bad URI(is not URI?):
```

This change sets the lock file to install above 0.3.2. I'm not sure what
folks are using in production but this prevents the oldest version like
that from being installed on travis.