Lighter weight/generic overpass downloader?

[rafaqz]

Hi, this package looks great. But much more than what I need. It would be nice have a package that just wraps overpass queries so we can do them from julia.

Any chance the downloads could be separated out into a sub-package and genrealised to any object type? (e.g. I need rivers...). This could be in the same repo but with only the HTTP dependency, and registered separately?