chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-05-12 00:00:22,048 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-monitoring/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-05-12 00:00:23,126 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/2d55dedf-791c-494a-9098-a3edd29024d6/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #546 (d69fe8d) into master (488f2f7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #546   +/-   ##
=========================================
  Coverage     77.29%   77.29%           
  Complexity      577      577           
=========================================
  Files            42       42           
  Lines          3849     3849           
  Branches         79       79           
=========================================
  Hits           2975     2975           
  Misses          777      777           
  Partials         97       97           

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