chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-14 00:47:02,752 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-texttospeech/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-14 00:47:04,052 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/e8305e63-1088-4ef6-9d17-08bca6f9c1c5/targets

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[codecov]

Codecov Report

Merging #427 (9a8d25d) into master (400ab40) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #427   +/-   ##
=========================================
  Coverage     66.21%   66.21%           
  Complexity       74       74           
=========================================
  Files            12       12           
  Lines           438      438           
  Branches          2        2           
=========================================
  Hits            290      290           
  Misses          146      146           
  Partials          2        2           

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