chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-20 22:51:00,040 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsublite/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-20 22:51:01,022 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/8186ced1-2f3f-400f-9fbd-2c4d98108540/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #309 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #309   +/-   ##
=========================================
  Coverage     71.48%   71.48%           
  Complexity      875      875           
=========================================
  Files           153      153           
  Lines          4714     4714           
  Branches        225      225           
=========================================
  Hits           3370     3370           
  Misses         1217     1217           
  Partials        127      127           

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