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I'm can't get Finch to expand region from a set of stage-specific variables. Issue here: fernando-mc/serverless-finch#17

For example, it should find region=us-east-1 for stage=dev:

$ sls client deploy --stage dev
Serverless: Deploying client to stage "dev" in region "${self:custom.region}"...

Note the lack of expansion of the region above. It continues...

Serverless: Bucket testfinch-dev exists Serverless: Listing objects in bucket testfinch-dev... Serverless: Deleting all objects from bucket testfinch-dev... Serverless: Configuring website bucket testfinch-dev... Serverless: Configuring policy for bucket testfinch-dev... Serverless: Configuring CORS policy for bucket testfinch-dev... Serverless: Uploading file index.html to bucket testfinch-dev...

But notice the undefined for the S3 URL which was to be mapped from the region name:

Serverless: If successful this should be deployed at:
Serverless: http://testfinch-dev.undefined/index.html

Using stage=prod on the invocation doesn't change anything -- we still have the :

$ sls client deploy --stage prod
Serverless: Deploying client to stage "prod" in region "${self:custom.region}"...
Serverless: Creating bucket testfinch-prod...
Serverless: Configuring website bucket testfinch-prod...
Serverless: Configuring policy for bucket testfinch-prod...
Serverless: Configuring CORS policy for bucket testfinch-prod...
Serverless: Uploading file index.html to bucket testfinch-prod...
Serverless: If successful this should be deployed at:
Serverless: http://testfinch-prod.undefined/index.html