Duplicate error message

[nsheff]

a yaml config with no version duplicates the warning:

looper run --package local --limit 1
Looper version: 1.7.0
Command: run
Using looper config (.looper.yaml).
Config file does not have version key. Defaulting to 2.1.0
Config file does not have version key. Defaulting to 2.1.0

[nsheff]

I think this is a duplicate of pepkit/peppy#483

[donaldcampbelljr]

Closing this in favor of the associated Peppy issue: pepkit/peppy#483