chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-04 19:43:53,310 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-accessapproval/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 19:43:54,223 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/7b335329-e6c8-42fe-9db3-dcc477ca5bc8/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #355 (b904205) into master (e0aeb6e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #355   +/-   ##
=========================================
  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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