Add explicit reference to the version of data package being installed

[kelliemac]

Description

add ref = "main" for data package installation and a comment about possibly needing to change this to reproduce an analysis from a particular point in time

Related Issues

related to #240

Checklist

• This PR includes unit tests
• This PR establishes a new function or updates parameters in an existing function
  • The roxygen skeleton for this function has been updated using devtools::document
• I have updated NEWS.md to describe the proposed changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.10%. Comparing base (b8969f4) to head (7ee2e1d).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #257   +/-   ##
========================================
  Coverage    82.10%   82.10%           
========================================
  Files            8        8           
  Lines          352      352           
========================================
  Hits           289      289           
  Misses          63       63           

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