chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-01-07 20:09:49,866 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-billingbudgets/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-01-07 20:09:50,759 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/ae8e98f3-5c4c-4b4e-b367-1a686acc712a/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #365 (351d149) into master (d37722b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #365   +/-   ##
=========================================
  Coverage     74.96%   74.96%           
  Complexity      107      107           
=========================================
  Files            12       12           
  Lines           775      775           
  Branches          6        6           
=========================================
  Hits            581      581           
  Misses          184      184           
  Partials         10       10           

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