get.dgraph.io/latest should allow CORS requests

[paulftw]

In-browser JS applications need to be able to read latest dgraph version from the get.dgraph.io/latest endpoint.

Examples when it can be useful:

• Ratel could warn admins when newer version of Dgraph is available
• Interactive Dgraph tour could auto-generate docker-compose file with latest image baked in
• etc.

Right now get.dgraph.io/latest endpoint is closed to any JS that isn't hosted on get.dgraph.io/.
For it to become accessible it should return CORS HTTP headers.

cc @danielmai @darkn3rd

[minhaj-shakeel]

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