pkgdown update, version bump to dev, and dev pkgdown update

[topepo]

If the 3.5 test still fails, I will probably still merge since the other versions pass.

The issue: even when caches are cleared, a seemingly cache-related 3.5 error was occurring during the build process:

* installing *source* package ‘testthat’ ...
** package ‘testthat’ successfully unpacked and MD5 sums checked
** libs
gcc -std=gnu99 -I"/home/travis/R-bin/lib/R/include" -DNDEBUG -I../inst/include -DCOMPILING_TESTTHAT  -I/home/travis/R-bin/include   -fpic  -g -O2  -c init.c -o init.o
gcc -std=gnu99 -I"/home/travis/R-bin/lib/R/include" -DNDEBUG -I../inst/include -DCOMPILING_TESTTHAT  -I/home/travis/R-bin/include   -fpic  -g -O2  -c reassign.c -o reassign.o
g++  -I"/home/travis/R-bin/lib/R/include" -DNDEBUG -I../inst/include -DCOMPILING_TESTTHAT  -I/home/travis/R-bin/include   -fpic  -g -O2  -c test-catch.cpp -o test-catch.o
g++  -I"/home/travis/R-bin/lib/R/include" -DNDEBUG -I../inst/include -DCOMPILING_TESTTHAT  -I/home/travis/R-bin/include   -fpic  -g -O2  -c test-example.cpp -o test-example.o
g++  -I"/home/travis/R-bin/lib/R/include" -DNDEBUG -I../inst/include -DCOMPILING_TESTTHAT  -I/home/travis/R-bin/include   -fpic  -g -O2  -c test-runner.cpp -o test-runner.o
g++ -shared -L/home/travis/R-bin/lib/R/lib -L/home/travis/R-bin/lib -o testthat.so init.o reassign.o test-catch.o test-example.o test-runner.o -L/home/travis/R-bin/lib/R/lib -lR
installing to /home/travis/R/Library/testthat/libs
** R
** inst
** byte-compile and prepare package for lazy loading
Error in rbind(info, getNamespaceInfo(env, "S3methods")) : 
  number of columns of matrices must match (see arg 2)
ERROR: lazy loading failed for package ‘testthat’
* removing ‘/home/travis/R/Library/testthat’
Error in i.p(...) : 
  (converted from warning) installation of package ‘testthat’ had non-zero exit status
Calls: <Anonymous> ... with_rprofile_user -> with_envvar -> force -> force -> i.p
Execution halted

When testthat was added to the list of binaries, and the caches were deleted, knitr failed with the same type of issue:

* installing *source* package ‘knitr’ ...
** package ‘knitr’ successfully unpacked and MD5 sums checked
** R
** demo
** inst
** byte-compile and prepare package for lazy loading
Error in rbind(info, getNamespaceInfo(env, "S3methods")) : 
  number of columns of matrices must match (see arg 2)
Error : unable to load R code in package ‘knitr’
ERROR: lazy loading failed for package ‘knitr’
* removing ‘/home/travis/R/Library/knitr’
Error in i.p(...) : 
  (converted from warning) installation of package ‘knitr’ had non-zero exit status
Calls: <Anonymous> ... with_rprofile_user -> with_envvar -> force -> force -> i.p
Execution halted

and tinytex after that...

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@54fcc26). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #201   +/-   ##
========================================
  Coverage          ?   76.7%           
========================================
  Files             ?      38           
  Lines             ?    3185           
  Branches          ?       0           
========================================
  Hits              ?    2443           
  Misses            ?     742           
  Partials          ?       0

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 54fcc26...a028010. Read the comment docs.

[github-actions]

This pull request has been automatically locked. If you believe you have found a related problem, please file a new issue (with a reprex: https://reprex.tidyverse.org) and link to this issue.