chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-11-12 09:13:40,846 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigqueryconnection/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-12 09:13:41,783 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #230 (9c58b5f) into master (a5dcd00) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #230   +/-   ##
=========================================
  Coverage     73.75%   73.75%           
  Complexity      152      152           
=========================================
  Files            12       12           
  Lines          1124     1124           
  Branches         15       15           
=========================================
  Hits            829      829           
  Misses          272      272           
  Partials         23       23           

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