Error(s) in re-building vignettes:
--- re-building ‘contribute.Rmd’ using rmarkdown
--- finished re-building ‘contribute.Rmd’

--- re-building ‘overview_colors.Rmd’ using rmarkdown
--- finished re-building ‘overview_colors.Rmd’

--- re-building ‘overview_shapes.Rmd’ using rmarkdown
trying URL 'https://raw.githubusercontent.com/simonjbrandl/fishape/master/shapes/Acanthuridae_Acanthurus.nigricauda.png'
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trying URL 'https://raw.githubusercontent.com/simonjbrandl/fishape/master/shapes/Pimelodidae_Brachyplathystoma.filamentosum.png'
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trying URL 'https://raw.githubusercontent.com/simonjbrandl/fishape/master/shapes/Pimelodidae_Brachyplatystoma.platynemum.png'
Warning in download.file(url, method = method, ...) :
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Quitting from lines 23-32 (overview_shapes.Rmd) 
Error: processing vignette 'overview_shapes.Rmd' failed with diagnostics:
cannot open URL 'https://raw.githubusercontent.com/simonjbrandl/fishape/master/shapes/Pimelodidae_Brachyplatystoma.platynemum.png'
--- failed re-building ‘overview_shapes.Rmd’

SUMMARY: processing the following file failed:
  ‘overview_shapes.Rmd’

Error: Vignette re-building failed.
Execution halted