Use stdout

[chapmanjacobd]

It's kind of a strange interface to create a file... that should be left up to the user.

With stdout you can use process substitution to interact with bdfr, for example in BASH:

python -m bdfr download bdfr/ --include-id-file <(~/bin/bdfr-failed.sh ~/.config/bdfr/log_output.txt*) 

or fish shell:

python -m bdfr download bdfr/ --include-id-file (~/bin/bdfr-failed.sh ~/.config/bdfr/log_output.txt* | psub) 

[Serene-Arc]

Hi, seems fine to me, but please update the Bash tests for this change.