Sample kraken2 command lacks --gzip-compressed flag #86
Description
Even though the kraken2 command in Episode 06 is just an example, it is incorrect and could cause problems when used as the excellent reference material that this lesson is :-)
Currently, kraken2 requires the --gzip-compressed flag if passing it gzipped files -- otherwise (as I learned) it will just pause forever rather than failing instantly (as I learned the hard way). Ref: https://github.com/DerrickWood/kraken2/wiki/Manual
I will submit a PR with this fix.