log_errors in rmarkdown

[jthorey]

I try to put errors in the log file from rmarkdown, but the compilation of the following rmarkdown fails :

---

title: "test logger"
output:
html_document

library(logger)
log_errors()

with the error
Error in globalCallingHandlers(error = function(m) { : should not be called with handlers on the stack.

[daroczig]

Unfortunately, both R markdown and logger try to use the same globalCallingHandlers -- which is not supported. Honestly, I do not see a way to overcome this limitation, see #70 for more details (marking as duplicated issue).