Pass rollbar client settings directly to snippet

..instead of a 'whitelist' of just a few, pass any client settings given to the smoke_detector provider config.

- [x] Update README
Completely valid. I've never found the modification hard because I use tools/plugins to maintain that for me. There are certainly different style camps on this, and I've found the alignment to be helpful to my brain, but it's probably because I've practiced on seeing things this way.