chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-02 23:30:21,514 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-asset/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-02 23:30:22,444 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/c60326fc-cb53-4487-8dc3-3b5a198374c0/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #585 (fa1908b) into master (e6c2fec) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #585   +/-   ##
=========================================
  Coverage     73.97%   73.97%           
  Complexity      280      280           
=========================================
  Files            36       36           
  Lines          2179     2179           
  Branches         11       11           
=========================================
  Hits           1612     1612           
  Misses          548      548           
  Partials         19       19           

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