chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-19 22:41:25,893 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-os-login/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-19 22:41:26,785 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/06b4e909-47cb-4d22-a294-8d56a92e3da6/targets

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[codecov]

Codecov Report

Merging #265 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #265   +/-   ##
=========================================
  Coverage     69.59%   69.59%           
  Complexity       64       64           
=========================================
  Files             6        6           
  Lines           444      444           
  Branches          7        7           
=========================================
  Hits            309      309           
  Misses          124      124           
  Partials         11       11           

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