chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-05-13 14:04:56,227 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-dialogflow/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-05-13 14:04:57,884 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/81e22696-d0b8-4734-a347-5b507efb1853/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #551 (d222aed) into master (0e0d5a3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #551   +/-   ##
=========================================
  Coverage     76.81%   76.81%           
  Complexity     2143     2143           
=========================================
  Files           180      180           
  Lines         14425    14425           
  Branches        193      193           
=========================================
  Hits          11081    11081           
  Misses         3079     3079           
  Partials        265      265           

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