Error(s) in re-building vignettes:
  ...
--- re-building ‘dictionary_draft_picks.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘dictionary_draft_picks.Rmd’

--- re-building ‘dictionary_ff_playerids.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘dictionary_ff_playerids.Rmd’

--- re-building ‘dictionary_ff_rankings.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘dictionary_ff_rankings.Rmd’

--- re-building ‘dictionary_nextgen_stats.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 21-26 (dictionary_nextgen_stats.Rmd) 
Error: processing vignette 'dictionary_nextgen_stats.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dictionary_nextgen_stats.Rmd’

--- re-building ‘dictionary_pbp.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 21-26 (dictionary_pbp.Rmd) 
Error: processing vignette 'dictionary_pbp.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dictionary_pbp.Rmd’

--- re-building ‘dictionary_pfr_passing.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 21-26 (dictionary_pfr_passing.Rmd) 
Error: processing vignette 'dictionary_pfr_passing.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dictionary_pfr_passing.Rmd’

--- re-building ‘dictionary_player_stats.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 21-26 (dictionary_player_stats.Rmd) 
Error: processing vignette 'dictionary_player_stats.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dictionary_player_stats.Rmd’

--- re-building ‘dictionary_rosters.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 21-26 (dictionary_rosters.Rmd) 
Error: processing vignette 'dictionary_rosters.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dictionary_rosters.Rmd’

--- re-building ‘dictionary_schedules.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 21-26 (dictionary_schedules.Rmd) 
Error: processing vignette 'dictionary_schedules.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dictionary_schedules.Rmd’

--- re-building ‘dictionary_snap_counts.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘dictionary_snap_counts.Rmd’

--- re-building ‘exporting_nflreadr.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘exporting_nflreadr.Rmd’

SUMMARY: processing the following files failed:
  ‘dictionary_nextgen_stats.Rmd’ ‘dictionary_pbp.Rmd’
  ‘dictionary_pfr_passing.Rmd’ ‘dictionary_player_stats.Rmd’
  ‘dictionary_rosters.Rmd’ ‘dictionary_schedules.Rmd’

Error: Vignette re-building failed.
Execution halted