Remove 'moribund' from README.md

[virtualsue]

Arguable if 'moribund' reflects badly on Ben Johnson, but removing the word doesn't change the overall meaning of the sentence.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@700b8ea). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #56   +/-   ##
=========================================
  Coverage          ?   85.56%           
=========================================
  Files             ?        9           
  Lines             ?     1857           
  Branches          ?        0           
=========================================
  Hits              ?     1589           
  Misses            ?      159           
  Partials          ?      109

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[xiang90]

lgtm. thanks.