chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-08 21:55:55,073 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsub/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-08 21:55:56,028 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/e406cfbe-f881-47cf-8da9-62e058d1ab12/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #379 into master will increase coverage by 0.53%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #379      +/-   ##
============================================
+ Coverage     76.09%   76.62%   +0.53%     
  Complexity      320      320              
============================================
  Files            23       23              
  Lines          3003     3003              
  Branches        178      178              
============================================
+ Hits           2285     2301      +16     
  Misses          635      635              
+ Partials         83       67      -16     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/google/cloud/pubsub/v1/TopicAdminClient.java	58.95% <0.00%> (+2.31%)	34.00% <0.00%> (ø%)
...oogle/cloud/pubsub/v1/SubscriptionAdminClient.java	63.06% <0.00%> (+5.40%)	52.00% <0.00%> (ø%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2345050...f5e0f25. Read the comment docs.