Include config directory in gem file
Include config directory in gem file

Commit 4b13f23 forgot to add the new `config` directory to the gemspec,
resulting in default configurations not being found (and the gem
ultimately crashing).

Change-Id: Ieff25d0e002c9dae069c16e88685a9b802254d4d
Reviewed-on: https://gerrit.causes.com/31531
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@causes.com>
Reviewed-by: Shane da Silva <6f6e68d1df92f30cb4b3ce35260ddf94a402f33d@causes.com>

ingdir/scss-lint,gatero/scss-lint,bkeepers/scss-lint,golmansax/scss-lint,leseulsteve/scss-lint,baileyparker/scss-lint,gajus/scss-lint,teoljungberg/scss-lint,ivantsepp/scss-lint,cih/scss-lint,chatzipan/scss-lint,dwayhs/scss-lint,philipgiuliani/scss-lint,davecarter/scss-lint