Push the scoop manifest into the bucket directory (#52)

Without a directory the scoop manifest landed at the repository root,
while the seeded manifests and the path scoop reads live under bucket/.
A scoop install would keep resolving the stale root-shadowed manifest.

Set directory: bucket so the release overwrites bucket/<tool>.json, the
same place the manifest is served from.

.goreleaser.yaml

@@ -169,6 +169,7 @@ scoops:
       owner: tamnd
       name: scoop-bucket
       token: '{{ .Env.SCOOP_BUCKET_GITHUB_TOKEN }}'
+    directory: bucket
     homepage: https://github.com/tamnd/kage
     description: Clone any website for offline viewing, with the JavaScript stripped out
     license: MIT