chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-15 15:30:38,481 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-logging/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-15 15:30:39,320 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/7521aff4-5cfd-4fe9-ab60-ebb2b60650e2/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #470 (3a2a198) into master (5d43881) will decrease coverage by 3.82%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #470      +/-   ##
============================================
- Coverage     78.86%   75.04%   -3.83%     
  Complexity      656      656              
============================================
  Files            44       44              
  Lines          4093     3045    -1048     
  Branches        247      196      -51     
============================================
- Hits           3228     2285     -943     
+ Misses          687      626      -61     
+ Partials        178      134      -44     

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/logging/spi/v2/GrpcLoggingRpc.java	30.26% <0.00%> (-10.08%)	1.00% <0.00%> (ø%)
...loud/logging/v2/stub/GrpcLoggingServiceV2Stub.java	81.03% <0.00%> (-9.27%)	12.00% <0.00%> (ø%)
.../logging/v2/stub/LoggingServiceV2StubSettings.java	65.71% <0.00%> (-8.96%)	16.00% <0.00%> (ø%)
.../logging/v2/stub/MetricsServiceV2StubSettings.java	76.66% <0.00%> (-6.32%)	15.00% <0.00%> (ø%)
...d/logging/v2/stub/ConfigServiceV2StubSettings.java	78.48% <0.00%> (-6.10%)	33.00% <0.00%> (ø%)
...loud/logging/v2/stub/GrpcMetricsServiceV2Stub.java	85.48% <0.00%> (-5.58%)	11.00% <0.00%> (ø%)
...java/com/google/cloud/logging/v2/ConfigClient.java	77.37% <0.00%> (-5.27%)	89.00% <0.00%> (ø%)
...src/main/java/com/google/cloud/logging/Option.java	75.00% <0.00%> (-5.00%)	7.00% <0.00%> (ø%)
...ava/com/google/cloud/logging/v2/MetricsClient.java	69.01% <0.00%> (-4.80%)	23.00% <0.00%> (ø%)
...ava/com/google/cloud/logging/v2/LoggingClient.java	74.03% <0.00%> (-4.19%)	24.00% <0.00%> (ø%)
... and 17 more

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[yoshi-approver]

Rubber stamped PR!