chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-30 18:18:17,870 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-kms/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-30 18:18:19,987 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #475 (8310901) into master (ebe53f0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #475   +/-   ##
=========================================
  Coverage     76.81%   76.81%           
  Complexity      174      174           
=========================================
  Files             6        6           
  Lines          1449     1449           
  Branches         25       25           
=========================================
  Hits           1113     1113           
  Misses          307      307           
  Partials         29       29           

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