chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-19 22:40:09,238 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-os-config/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-19 22:40:10,146 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/ac5b2e14-d66f-4fd1-9760-ea28e4ca2e0a/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #139 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #139   +/-   ##
=========================================
  Coverage     74.65%   74.65%           
  Complexity       76       76           
=========================================
  Files             6        6           
  Lines           651      651           
  Branches         10       10           
=========================================
  Hits            486      486           
  Misses          153      153           
  Partials         12       12           

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