remove extra line return in knitr output

bin/chunk-options.R

@@ -27,12 +27,14 @@ hook_in <- function(x, options) {
 }
 
 hook_out <- function(x, options) {
+  x <- gsub("\n$", "", x)
   stringr::str_c("\n\n~~~\n",
                    paste0(x, collapse="\n"),
                  "\n~~~\n{: .output}\n\n")
 }
 
 hook_error <- function(x, options) {
+  x <- gsub("\n$", "", x)
   stringr::str_c("\n\n~~~\n",
                  paste0(x, collapse="\n"),
                  "\n~~~\n{: .error}\n\n")