chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-23 15:47:25,951 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-iot/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-23 15:47:26,835 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #410 (8829661) into master (0ac0ff5) will decrease coverage by 1.36%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #410      +/-   ##
============================================
- Coverage     83.74%   82.37%   -1.37%     
  Complexity      172      172              
============================================
  Files             6        6              
  Lines          1101     1101              
  Branches         18        3      -15     
============================================
- Hits            922      907      -15     
  Misses          155      155              
- Partials         24       39      +15     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/google/cloud/iot/v1/DeviceManagerClient.java	80.07% <0.00%> (-5.44%)	111.00% <0.00%> (ø%)

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