Error(s) in re-building vignettes:
  ...
--- re-building ‘SwimmeR.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: xml2

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

Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb", "Exhibition", "DQ")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Row_Numb", "Exhibition", "DQ")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Joining, by = c("Name", "Place", "Grade", "School", "Row_Numb", "DQ")
Joining, by = c("Name", "Place", "Grade", "School", "Prelims_Time", "Finals_Time", "Points", "Row_Numb")
Quitting from lines 100-103 (SwimmeR.Rmd) 
Error: processing vignette 'SwimmeR.Rmd' failed with diagnostics:
cannot open the connection to 'https://github.com/gpilgrim2670/Pilgrim_Data/raw/master/ISL/ISL_2019_CollegePark_Day_1.pdf'
--- failed re-building ‘SwimmeR.Rmd’

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

Error: Vignette re-building failed.
Execution halted