chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-08 21:37:12,533 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-kms/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-08 21:37:13,409 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/0b250bb2-0ec5-4d82-aaa6-e38750bfec6b/targets

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[codecov]

Codecov Report

Merging #284 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #284      +/-   ##
============================================
+ Coverage     76.79%   76.81%   +0.01%     
- Complexity      150      174      +24     
============================================
  Files             6        6              
  Lines          1349     1449     +100     
  Branches          5       25      +20     
============================================
+ Hits           1036     1113      +77     
- Misses          288      307      +19     
- Partials         25       29       +4     

Impacted Files	Coverage Δ	Complexity Δ
...oogle/cloud/kms/v1/KeyManagementServiceClient.java	58.58% <0.00%> (-1.36%)	99.00% <0.00%> (+22.00%)	⬇️
.../kms/v1/stub/KeyManagementServiceStubSettings.java	83.50% <0.00%> (+0.17%)	36.00% <0.00%> (+1.00%)
...loud/kms/v1/stub/GrpcKeyManagementServiceStub.java	97.76% <0.00%> (+0.21%)	33.00% <0.00%> (+1.00%)

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