chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-02-25 00:58:53,326 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquerydatatransfer/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-25 00:58:54,957 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #657 (aa8db56) into master (c91eac7) will decrease coverage by 0.43%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #657      +/-   ##
============================================
- Coverage     80.89%   80.46%   -0.44%     
- Complexity      108      132      +24     
============================================
  Files             7        7              
  Lines           895      952      +57     
  Branches         18       18              
============================================
+ Hits            724      766      +42     
  Misses          163      163              
- Partials          8       23      +15     

Impacted Files	Coverage Δ	Complexity Δ
...ery/datatransfer/v1/DataTransferServiceClient.java	83.19% <0.00%> (-4.88%)	81.00% <0.00%> (+22.00%)	⬇️
...nsfer/v1/stub/DataTransferServiceStubSettings.java	82.72% <0.00%> (+0.25%)	24.00% <0.00%> (+1.00%)
...atransfer/v1/stub/GrpcDataTransferServiceStub.java	95.89% <0.00%> (+0.35%)	21.00% <0.00%> (+1.00%)

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