chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-05-10 17:36:57,709 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigtable/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-05-10 17:36:58,902 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #803 (9b1869b) into master (b0e72a3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #803   +/-   ##
=========================================
  Coverage     83.46%   83.46%           
  Complexity     1315     1315           
=========================================
  Files           114      114           
  Lines          7806     7806           
  Branches        446      446           
=========================================
  Hits           6515     6515           
  Misses         1036     1036           
  Partials        255      255           

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