serial: 1.1.6-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `serial` to `1.1.5-0` from `1.1.6-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.4.9`

```
Changes for serial 1.1.6:
* Move stopbits_one_point_five to the end of the enum, so that it doesn't alias with stopbits_two.
```