chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-16 00:17:03,731 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-iot/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-16 00:17:04,661 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/af5ace54-d1a4-4b73-a820-47d330c48da2/targets

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[codecov]

Codecov Report

Merging #256 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #256   +/-   ##
=========================================
  Coverage     77.27%   77.27%           
  Complexity      142      142           
=========================================
  Files             6        6           
  Lines          1100     1100           
  Branches         18       18           
=========================================
  Hits            850      850           
  Misses          226      226           
  Partials         24       24           

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