=BG= fn delete should use http::method::Delete

This is the enum: https://github.com/chris-morgan/rust-http/blob/8c8064affd7d20230a86e4886fb93abf96671a3a/src/http/method.rs#L14
Merge pull request #51 from bguiz/patch-1

=BG= fn delete should use http::method::Delete