chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-13 15:47:33,655 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-asset/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-13 15:47:34,962 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/b29e3606-c4c7-4ba8-80d1-7fc334a5e27c/targets

• To automatically regenerate this PR, check this box. (May take up to 24 hours.)

[codecov]

Codecov Report

Merging #650 (4f12757) into master (726fa83) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #650   +/-   ##
=========================================
  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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