DRY up code by using Cache::w for Workflows object

No need to create a whole separate `Workflows` object inside the
`Repo` object, as we already have one inside `$this->cache`.

Best to use the objects we already have!
Bump to v2.02 & update alfredworkflow
Merge pull request #46 from jeffbyrnes/dry-up-repos-workflows

DRY up code by using `Cache::w` for `Workflows` object