Updating DESCRIPTION, perf_profile, roxygen2 to version: 8.1.1, plus …

[StuartWheater]

…side effects

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.80%. Comparing base (b253c54) to head (45ea3a1).
⚠️ Report is 1 commits behind head on refactor/tests.

Additional details and impacted files

@@               Coverage Diff               @@
##           refactor/tests      #49   +/-   ##
===============================================
  Coverage           60.80%   60.80%           
===============================================
  Files                 143      143           
  Lines                5373     5373           
===============================================
  Hits                 3267     3267           
  Misses               2106     2106           

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