Encryption docs are missing from cli help

[machawk1]

ipwb -h index invokes the indexer's help contents via argparse. The newly added encryption feature invoked via ipwb -e index (warcPath) is not included in the "optional arguments" section when ipwb -h index is run.

Despite this, ipwb -e index DOES show the flag under usage but not documentation is available. Check the argparse code to see if something is missing from this sub-parsers definition.

[machawk1]

-h AFTER index shows the description. Not sure why ipwb -h index does not. It might have to do with the argparse hierarchy used.

➜  ipwb git:(master) ipwb index   
usage: ipwb [-h] [-e] index <warcPath>
ipwb: error: too few arguments
➜  ipwb git:(master) ipwb index -h
usage: ipwb [-h] [-e] index <warcPath>

Index a WARC file for replay in ipwb

positional arguments:
  index <warcPath>  Path to a WARC[.gz] file

optional arguments:
  -h, --help        show this help message and exit
  -e                Encrypt WARC content prior to disseminating to IPFS
➜  ipwb git:(master)

[machawk1]

ipwb -h foo invokes the primary argparse instance. The secondary parser look to require the secondary command, e.g., ipwb index -h foo.