Error(s) in re-building vignettes:
--- re-building 'flags.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Quitting from lines 32-40 (flags.Rmd) 
Error: processing vignette 'flags.Rmd' failed with diagnostics:
Problem with `mutate()` input `html`.
x SSL certificate problem: unable to get local issuer certificate
i Input `html` is `purrr::map(...)`.
--- failed re-building 'flags.Rmd'

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

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

--- re-building 'interpolate_data.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building 'interpolate_data.Rmd'

--- re-building 'normals.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building 'normals.Rmd'

--- re-building 'weathercan.Rmd' using rmarkdown

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Quitting from lines 87-89 (weathercan.Rmd) 
Error: processing vignette 'weathercan.Rmd' failed with diagnostics:
Problem with `mutate()` input `html`.
x SSL certificate problem: unable to get local issuer certificate
i Input `html` is `purrr::map(...)`.
--- failed re-building 'weathercan.Rmd'

SUMMARY: processing the following files failed:
  'flags.Rmd' 'weathercan.Rmd'

Error: Vignette re-building failed.
Execution halted