chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-11-11 09:10:20,856 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-billingbudgets/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-11 09:10:21,831 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/5bde42ae-1ef1-422b-8d9c-45fdc75733f3/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #319 (74228d6) into master (9d6dc32) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #319   +/-   ##
=========================================
  Coverage     73.86%   73.86%           
  Complexity      102      102           
=========================================
  Files            12       12           
  Lines           773      773           
  Branches          6        6           
=========================================
  Hits            571      571           
  Misses          192      192           
  Partials         10       10           

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