Save and re-use reqwest instance

[option-greek]

Currently the reqwest client seem to be created always for executing a query:

let mut req = Client::new().request(self.method.clone(), &self.url);

This will end up doing a SSL handshake every time. It's better to create it once and reuse it to improve performance.

[spencerbart]

Has this been resolved?

[soedirgo]

Nope - PRs welcome though!