chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-13 15:40:31,455 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-accessapproval/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-13 15:40:32,861 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/9e654281-ed91-4513-b129-1ee564a5472e/targets

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[codecov]

Codecov Report

Merging #393 (066d510) into master (fe093bc) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #393   +/-   ##
=========================================
  Coverage     77.75%   77.75%           
  Complexity       64       64           
=========================================
  Files             6        6           
  Lines           472      472           
  Branches          2        2           
=========================================
  Hits            367      367           
  Misses          103      103           
  Partials          2        2           

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