chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-11-19 17:07:55,672 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-billingbudgets/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-11-19 17:07:56,569 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/ae4c9b58-656c-424d-999a-1eff31b16231/targets

• To automatically regenerate this PR, check this box.

[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #335 (e833e04) into master (b26d07f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #335   +/-   ##
=========================================
  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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