chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-09 19:40:27,248 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-errorreporting/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-09 19:40:28,574 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/8e2c36ed-f374-41f0-a89a-8a0a93b96990/targets

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[codecov]

Codecov Report

Merging #487 (3e7a726) into master (878d4e9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #487   +/-   ##
=========================================
  Coverage     67.98%   67.98%           
  Complexity      119      119           
=========================================
  Files            18       18           
  Lines           784      784           
  Branches         11       11           
=========================================
  Hits            533      533           
  Misses          241      241           
  Partials         10       10           

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[yoshi-approver]

Rubber stamped PR!