Bumped ros_controllers

For some reason the automatic version didn't work: @wjwwood

```
Open a pull request from 'davetcoleman/rosdistro:bloom-patch-3' into 'ros/rosdistro:master'?
Continue [Y/n]? Y
==> git checkout -b bloom-patch-3 bloom/master
Branch bloom-patch-3 set up to track remote branch master from bloom.
Switched to a new branch 'bloom-patch-3'
==> Writing new distribution file: hydro/release.yaml
==> git add hydro/release.yaml
==> git commit -m "ros_controllers: 0.5.1-0 in 'hydro/release.yaml' [bloom]"
[bloom-patch-3 20d85d7] ros_controllers: 0.5.1-0 in 'hydro/release.yaml' [bloom]
 1 file changed, 1 insertion(+), 1 deletion(-)
==> git push origin bloom-patch-3
To https://github.com/davetcoleman/rosdistro.git
 * [new branch]      bloom-patch-3 -> bloom-patch-3
Failed to create pull request: 401 Unauthorized
```