Correct a typo in readme files

[billdenney]

Please ensure the following before submitting a PR:

• if suggesting code changes or improvements, open an issue first
• for all but trivial changes (e.g., typo fixes), add your name to DESCRIPTION
• for all but trivial changes (e.g., typo fixes), documentation your change in NEWS.md with a parenthetical reference to the issue number being addressed
• if changing documentation, edit files in /R not /man and run devtools::document() to update documentation
• add code or new test files to /tests for any new functionality or bug fix
• make sure R CMD check runs without error before submitting the PR

Typo fix for the readme files. (And thanks for implementing the export_list() functionality!)

[codecov-io]

Codecov Report

Merging #266 into master will decrease coverage by 0.72%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
- Coverage   86.75%   86.02%   -0.73%     
==========================================
  Files          20       20              
  Lines         959      959              
==========================================
- Hits          832      825       -7     
- Misses        127      134       +7

Impacted Files	Coverage Δ
R/remote_to_local.R	44.73% <0%> (-18.43%)	⬇️

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[leeper]

Thanks!