chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-02-25 15:11:21,957 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-language/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-25 15:11:23,544 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/262e0714-c2de-4a22-8663-c5c1f7f6e21f/targets

• To automatically regenerate this PR, check this box.

[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #387 (8dfc550) into master (2101a30) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #387   +/-   ##
=========================================
  Coverage     76.30%   76.30%           
  Complexity      138      138           
=========================================
  Files            12       12           
  Lines           768      768           
  Branches          2        2           
=========================================
  Hits            586      586           
  Misses          180      180           
  Partials          2        2           

---

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 2101a30...7a22ae9. Read the comment docs.