Add ROBINS I V2 funcitonality

[jrob95]

PR Checklist

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Does your submission pass R CMD check locally?
• Have you sufficiently documented the new functionality?
• Have you added tests for any new functionality this PR introduces?

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Updates package to include the ROBIN I V2 tool (see issue #165)
Additionally, test snap shots have been updated and code has been styled to tidyverse standards.

What is the current behavior? (You can also link to an open issue here)

No ROBIN I V2 functions

What is the new behavior (if this is a feature change)?

ROBIN I V2 functions

Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

no

Other relevant information:

no

Thanks, Jack