Error(s) in re-building vignettes:
--- re-building 'calculating_accessibility.Rmd' using rmarkdown
Could not fetch https://github.com/ipeaGIT/r5r/blob/master/r-package/inst/img/vig_accessibility.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/ipeaGIT/r5r/blob/master/r-package/inst/img/vig_accessibility.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 ConnectionTimeout
Error: processing vignette 'calculating_accessibility.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'calculating_accessibility.Rmd'

--- re-building 'calculating_isochrones.Rmd' using rmarkdown
--- finished re-building 'calculating_isochrones.Rmd'

--- re-building 'intro_to_r5r.Rmd' using rmarkdown
Loading required namespace: sf
Loading required namespace: rJava
Please make sure you have already allocated some memory to Java by running:
  options(java.parameters = '-Xmx2G').
Currently, Java memory is set to -Xmx512m
Linking to GEOS 3.9.1, GDAL 3.4.3, PROJ 7.2.1; sf_use_s2() is TRUE
Could not fetch https://github.com/ipeaGIT/r5r/blob/master/r-package/inst/img/vig_detailed_ggplot.png?raw=true
HttpExceptionRequest Request {
  host                 = "github.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/ipeaGIT/r5r/blob/master/r-package/inst/img/vig_detailed_ggplot.png"
  queryString          = "?raw=true"
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (InternalException (HostCannotConnect "github.com" [Network.Socket.connect: <socket: 940>: failed (Connection timed out (WSAETIMEDOUT))]))
Error: processing vignette 'intro_to_r5r.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'intro_to_r5r.Rmd'

SUMMARY: processing the following files failed:
  'calculating_accessibility.Rmd' 'intro_to_r5r.Rmd'

Error: Vignette re-building failed.
Execution halted