Update cms.yml
Update cms.yml

fixes error in CMS:
 [User Notice] File resources/cyber-duck/silverstripe-seo/assets/css/seo.css does not exist
Cyber-Duck/Silverstripe-SEO,Andrew-Mc-Cormack/Silverstripe-SEO,Cyber-Duck/Silverstripe-SEO,Andrew-Mc-Cormack/Silverstripe-SEO