bookdown 0.43
- Support
split_byfor section level higher than2(i.e.,##sections) ingitbook(thanks, @katrinabrock #1490, @lcougnaud #1346 #1347).
split_by for section level higher than 2 (i.e., ## sections) in gitbook (thanks, @katrinabrock #1490, @lcougnaud #1346 #1347).