Error(s) in re-building vignettes:
  ...
--- re-building ‘bbricks-getting-started.Rmd’ using rmarkdown
Could not fetch https://travis-ci.org/chenhaotian/Bayesian-Bricks.svg?branch=master
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Error: processing vignette ‘bbricks-getting-started.Rmd’ failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘bbricks-getting-started.Rmd’

SUMMARY: processing the following file failed:
  ‘bbricks-getting-started.Rmd’

Error: Vignette re-building failed.
Execution halted