README Update for encrypted SSH key usage

[nandorholozsnyak]

init.sh contains this:

if [ -n "$IDENC" ]
then
  ID=$(echo $IDENC |base64 -d)
  IDPUB=$(echo $IDPUBENC |base64 -d)
fi

And the README.md said that to use base64 encoded values in ID and IDPUB environment variables and that is wrong! These fields need pure raw ssh keys, if you want to use base64 encoded values please use the IDENC and IDPUBENC for safety.

[nandorholozsnyak]

It's a really good and handy tool, please keep it up-to-date :D

[gjonespf]

Hey @Holi60k - cheers for this. Yeah, just a fork of the original tool with merges from good forks, as original hasn't been updated in ages. I don't actually use these SSH parameters atm, I recall tinkering with trying to get this working consistently and having issues. Will test these out and merge if all good.