chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-16 00:16:40,744 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-document-ai/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-16 00:16:41,693 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/c337c9e1-9d48-4637-aff2-8d428d2de21b/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #221 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #221   +/-   ##
=========================================
  Coverage     68.22%   68.22%           
  Complexity      118      118           
=========================================
  Files            18       18           
  Lines           853      853           
  Branches          4        4           
=========================================
  Hits            582      582           
  Misses          263      263           
  Partials          8        8           

---

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 26143cd...58b59cd. Read the comment docs.