docs: fix simple typo, retreve -> retrieve

[timgates42]

There is a small typo in README.md.

Should read retrieve rather than retreve.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[codecov[bot]]

Codecov Report

Merging #24 (b901b58) into master (f02f0df) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #24   +/-   ##
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  Coverage   99.16%   99.16%           
=======================================
  Files           4        4           
  Lines         480      480           
=======================================
  Hits          476      476           
  Misses          4        4           

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