Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
trying URL 'https://hughparsonage.github.io/tax-drat/src/contrib/taxstats_0.1.0.1415.tar.gz'
Content type 'application/gzip' length 60898251 bytes (58.1 MB)
==================================================
downloaded 58.1 MB

* installing *source* package ‘taxstats’ ...
** R
** data
*** moving datasets to lazyload DB
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (taxstats)

The downloaded source packages are in
	'/tmp/RtmpZ2aiuR/downloaded_packages'
trying URL 'https://hughparsonage.github.io/tax-drat/src/contrib/taxstats1516_1.0.0.tar.gz'
Content type 'application/gzip' length 7492439 bytes (7.1 MB)
==================================================
downloaded 7.1 MB

* installing *source* package ‘taxstats1516’ ...
** R
** data
*** moving datasets to lazyload DB
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (taxstats1516)

The downloaded source packages are in
	'/tmp/RtmpZ2aiuR/downloaded_packages'
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
trying URL 'https://hughparsonage.github.io/tax-drat/src/contrib/taxstats1516_1.0.0.tar.gz'
Content type 'application/gzip' length 7492439 bytes (7.1 MB)
==================================================
downloaded 7.1 MB

* installing *source* package ‘taxstats1516’ ...
** R
** data
*** moving datasets to lazyload DB
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
* DONE (taxstats1516)

The downloaded source packages are in
	'/tmp/RtmpZ2aiuR/downloaded_packages'
Quitting from lines 32-39 (v201515-taxstats.Rmd) 
Error: processing vignette 'v201515-taxstats.Rmd' failed with diagnostics:
cannot allocate vector of size 67.1 Mb
Execution halted