Include http feature on object_store

[kylebarron]

Right now the http feature is not included

object-store-python/object-store/Cargo.toml

Lines 13 to 18 in 4f0454f

	object_store = { version = "0.5.6", features = [
	"azure",
	"aws",
	"gcp",
	"aws_profile",
	] }

We should include the http feature as well; it should be low impact. This should be a small PR; I'll wait until some of the other PRs have been merged.