Ability to only get restic output to stdout

[varac]

Is your feature request related to a problem? Please describe.

I'd like to write certain restic output to a file / stdout. i.e. I'd like to get the json stats like this:

autorestic -v exec -a -- --json snapshots > snapshots.json

However, this mixes autorestic and restic output in a way that no valid json is produced.

Describe the solution you'd like

autorestic could provide a flag that redirect it's own output to stderr and restic's output to stdout, i.e.

autorestic -v --capture-restic-stdout exec -a -- --json snapshots > snapshots.json

What do you think ?

[cupcakearmy]

Sounds related to #104 I see two ways to approach here:

1. implement some --json flag
2. have a new --omit-resitc (some better name) flag to suppress only the autorestic part