158 - fixed small bug where options could not be passed - closes #158

## Changes
* Fixed small issue where opts could not be passed into the client_user_groups method

## Results
* Ran unit and rubocop tests as per the contributing guidelines and had no issues
```
Finished in 0.03095 seconds (files took 1.93 seconds to load)
41 examples, 0 failures

93 files inspected, no offenses detected
```