download_hydat doesn't work to other file locations

[boshek]

> download_hydat(dl_hydat_here = "C:/_dev/diversions/")
Downloading HYDAT will take ~10 minutes.
This will remove any older versions of HYDAT
Is that okay?
--------------------------------------------------------------------------------

1: Yes
2: No

Selection: 1
* Downloading HYDAT.sqlite3 to C:/_dev/diversions/
* Downloading version of HYDAT created on 2019-07-17
  |========================================================================================================| 100%
* Extracting HYDAT
Error in utils::unzip(tmp, exdir = dl_hydat_here, overwrite = TRUE) : 
  'exdir' does not exist