Add support for reqwest-middleware 0.3.0

[lededje]

Reqwest updated to 0.12 recently and their implementation of reqwest changed. This required reqwest middleware to update it's implementation which in turn made rvcr incompatible with it's most recent version.

Please can we update reqwest middleware to 0.3

[lededje]

The updates I made are as follows:

reqwest = { version = "0.12.4" }
reqwest-middleware = "0.3.0"
http = "1.0.0"

~There is still a lifetime issue on the handle method for impl Middleware that I'm unable to resolve.~

This looked to be a change in the struct that now references a different argument type.