chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-19 18:06:26,415 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-logging/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-19 18:06:27,289 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/20e4a86b-50b1-4594-b0ba-505ee4279396/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #474 (481fa1e) into master (e4acb6c) will increase coverage by 0.68%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #474      +/-   ##
============================================
+ Coverage     78.86%   79.55%   +0.68%     
  Complexity      656      656              
============================================
  Files            44       44              
  Lines          4093     4098       +5     
  Branches        247      276      +29     
============================================
+ Hits           3228     3260      +32     
- Misses          687      688       +1     
+ Partials        178      150      -28     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/google/cloud/logging/LoggingImpl.java	89.70% <0.00%> (-0.15%)	79.00% <0.00%> (ø%)
...ava/com/google/cloud/logging/v2/LoggingClient.java	79.83% <0.00%> (+1.61%)	24.00% <0.00%> (ø%)
...ava/com/google/cloud/logging/v2/MetricsClient.java	79.76% <0.00%> (+5.95%)	23.00% <0.00%> (ø%)
...java/com/google/cloud/logging/v2/ConfigClient.java	89.93% <0.00%> (+7.29%)	89.00% <0.00%> (ø%)

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