minor update to setup-r-dependencies readme

[jpiaskowski]

addressing issue #570

[codecov-commenter]

Codecov Report

Merging #571 (fc20c40) into v2-branch (8e8f7ed) will not change coverage. The diff coverage is n/a.

@@             Coverage Diff             @@
##           v2-branch      #571   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
===========================================
  Files              2         2           
  Lines             10        10           
===========================================
  Hits              10        10           

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[github-actions[bot]]

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