chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-05-11 01:27:01,060 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-asset/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-05-11 01:27:02,472 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/b72b6121-594b-4e8b-bb4e-865349b0b5c3/targets

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

[codecov]

Codecov Report

Merging #692 (a956548) into master (b2a1ce9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #692   +/-   ##
=========================================
  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           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b2a1ce9...a956548. Read the comment docs.

[yoshi-approver]

Rubber stamped PR!