silent format is missing

[abrekhov]

Describe the bug
I'm trying to make goss validate with -f silent and getting such output:
Error: bad output format: silent

How To Reproduce

docker run -ti alpine sh
apk add curl
echo hello > hello.txt
goss a file hello.txt
goss v -f silent

Expected Behavior
Exit status 0 and no error

Actual Behavior
Error: bad output format: silent

Environment:

• Version of goss = 0.3.14
• OS/Distribution version (if applicable)

[aelsabbahy]

@petemounce FYI. Also, if you have a chance take a quick look at #657, pretty sure that's the fix.. just want to make sure I'm not missing anything with the refactor.

[aelsabbahy]

@abrekhov I'll try to get the fix released as soon as possible, in the meantime if you don't need the v0.3.14 features, v0.3.13 silent correctly works

[aelsabbahy]

Fixed in 0.3.15

Thanks for reporting this!