serial: 1.1.7-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `serial` to `1.1.7-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.4.9`
- previous version for package: `1.1.5-0`

## serial -> 1.1.7

```
* Improved support for mingw (mxe.cc)
* Fix compilation warning
  See issue #53 <https://github.com/wjwwood/serial/issues/53>
* Improved timer handling in unix implementation
* fix broken ifdef _WIN32
* Fix broken ioctl calls, add exception handling.
* Code guards for platform-specific implementations. (when not using cmake / catkin)
* Contributors: Christopher Baker, Mike Purvis, Nicolas Bigaouette, William Woodall, dawid
```