Update README.md

[millerjoey]

It's a registered package now, so you can add it more concisely.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@cc1af1a). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #11   +/-   ##
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  Coverage          ?   83.64%           
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  Files             ?       13           
  Lines             ?      159           
  Branches          ?        0           
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  Hits              ?      133           
  Misses            ?       26           
  Partials          ?        0           

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