chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-12 15:30:49,475 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-storage/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-12 15:30:51,104 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/042d52ac-0e6f-4abd-aaf5-ac634b69c57f/targets

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[codecov]

Codecov Report

Merging #777 (a4ec36c) into master (a33d251) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #777   +/-   ##
=========================================
  Coverage     64.61%   64.61%           
  Complexity      634      634           
=========================================
  Files            32       32           
  Lines          5313     5313           
  Branches        519      519           
=========================================
  Hits           3433     3433           
  Misses         1718     1718           
  Partials        162      162           

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[yoshi-approver]

Rubber stamped PR!