chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-30 18:14:17,797 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsub/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-30 18:14:19,057 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #638 (7d35eab) into master (0488a27) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #638      +/-   ##
============================================
- Coverage     78.88%   78.83%   -0.06%     
  Complexity      379      379              
============================================
  Files            27       27              
  Lines          3420     3420              
  Branches        171      171              
============================================
- Hits           2698     2696       -2     
- Misses          650      651       +1     
- Partials         72       73       +1     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/google/cloud/pubsub/v1/Publisher.java	87.16% <0.00%> (-0.49%)	47.00% <0.00%> (ø%)

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