chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-23 15:44:20,360 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-billingbudgets/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-23 15:44:21,170 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[codecov]

Codecov Report

Merging #426 (fddd1c7) into master (285ff5f) will decrease coverage by 0.60%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #426      +/-   ##
============================================
- Coverage     74.96%   74.35%   -0.61%     
+ Complexity      107       97      -10     
============================================
  Files            12       12              
  Lines           775      741      -34     
  Branches          6        6              
============================================
- Hits            581      551      -30     
  Misses          184      184              
+ Partials         10        6       -4     

Impacted Files	Coverage Δ	Complexity Δ
...d/billing/budgets/v1beta1/BudgetServiceClient.java	66.00% <0.00%> (-0.67%)	13.00% <0.00%> (ø%)
...billing/budgets/v1/stub/GrpcBudgetServiceStub.java	91.52% <0.00%> (-0.61%)	11.00% <0.00%> (-1.00%)
...ng/budgets/v1beta1/stub/GrpcBudgetServiceStub.java	91.52% <0.00%> (-0.61%)	11.00% <0.00%> (-1.00%)
...ing/budgets/v1/stub/BudgetServiceStubSettings.java	81.15% <0.00%> (-0.54%)	14.00% <0.00%> (-1.00%)
...udgets/v1beta1/stub/BudgetServiceStubSettings.java	81.15% <0.00%> (-0.54%)	14.00% <0.00%> (-1.00%)
.../cloud/billing/budgets/v1/BudgetServiceClient.java	74.66% <0.00%> (+2.71%)	22.00% <0.00%> (-6.00%)	⬆️

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[yoshi-approver]

Rubber stamped PR!