chore: removed "extern crate" when possible

src/main.rs

@@ -1,18 +1,11 @@
-#[macro_use]
-extern crate log;
-
 #[macro_use]
 extern crate prometheus;
 
-#[macro_use]
-extern crate serde_derive;
-
-extern crate serde_json;
-
 mod config;
 mod tado;
 
 use env_logger::Env;
+use log::{info, error};
 use tokio;
 use std::convert::Infallible;
 use std::time::Duration;

src/tado/client.rs

@@ -1,7 +1,7 @@
-extern crate reqwest;
-
 use log::{info, error};
 use std::vec::Vec;
+use reqwest;
+
 use super::model::{AuthApiResponse, MeApiResponse, ZonesApiResponse, ZoneStateApiResponse, ZoneStateResponse};
 
 const AUTH_URL: &'static str = "https://auth.tado.com/oauth/token";

src/tado/metrics.rs

@@ -2,6 +2,7 @@ use std::convert::Infallible;
 
 use super::model::ZoneStateResponse;
 
+use log::info;
 use lazy_static::lazy_static;
 use hyper::{header::CONTENT_TYPE, Body, Request, Response};
 use prometheus::{Encoder, GaugeVec, TextEncoder};

src/tado/model.rs

@@ -1,3 +1,5 @@
+use serde_derive::Deserialize;
+
 #[derive(Deserialize, Debug)]
 pub struct AuthApiResponse {
     pub access_token: String,