chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-01-07 22:21:46,285 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-asset/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-01-07 22:21:47,177 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/5e633bbe-e320-4eef-96af-491fd7f1b14f/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #512 (c1bc7b2) into master (f5e20bb) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #512   +/-   ##
=========================================
  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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[yoshi-approver]

Rubber stamped PR!