chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-04 16:06:52,624 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-vision/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 16:06:53,592 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/33b9aa81-a40f-4de0-a7e5-45a044cf9264/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #432 (fcfee81) into master (7ea1745) will decrease coverage by 11.21%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master     #432       +/-   ##
=============================================
- Coverage     78.82%   67.60%   -11.22%     
+ Complexity      743      625      -118     
=============================================
  Files            48       48               
  Lines          5199     3121     -2078     
  Branches         82       12       -70     
=============================================
- Hits           4098     2110     -1988     
+ Misses         1001      929       -72     
+ Partials        100       82       -18     

Impacted Files	Coverage Δ	Complexity Δ
...e/cloud/vision/v1/stub/GrpcImageAnnotatorStub.java	77.50% <0.00%> (-11.16%)	11.00% <0.00%> (-1.00%)
.../vision/v1p4beta1/stub/GrpcImageAnnotatorStub.java	77.50% <0.00%> (-11.16%)	11.00% <0.00%> (-1.00%)
.../vision/v1p2beta1/stub/GrpcImageAnnotatorStub.java	73.33% <0.00%> (-10.00%)	9.00% <0.00%> (-1.00%)
.../vision/v1p3beta1/stub/GrpcImageAnnotatorStub.java	73.33% <0.00%> (-10.00%)	9.00% <0.00%> (-1.00%)
...ion/v1p3beta1/stub/ImageAnnotatorStubSettings.java	74.24% <0.00%> (-9.85%)	12.00% <0.00%> (ø%)
...oud/vision/v1/stub/ImageAnnotatorStubSettings.java	75.30% <0.00%> (-9.64%)	15.00% <0.00%> (ø%)
...ion/v1p4beta1/stub/ImageAnnotatorStubSettings.java	75.30% <0.00%> (-9.54%)	15.00% <0.00%> (ø%)
...ion/v1p2beta1/stub/ImageAnnotatorStubSettings.java	73.01% <0.00%> (-9.34%)	12.00% <0.00%> (ø%)
.../vision/v1p1beta1/stub/GrpcImageAnnotatorStub.java	66.66% <0.00%> (-8.34%)	7.00% <0.00%> (ø%)
...loud/vision/v1/stub/ProductSearchStubSettings.java	77.02% <0.00%> (-7.49%)	30.00% <0.00%> (-1.00%)
... and 22 more

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[yoshi-approver]

Rubber stamped PR!