Use derive feature of serde instead of serde_derive

Cargo.toml

@@ -18,8 +18,7 @@ chrono              = "0.4"
 failure             = "0.1"
 inth-oauth2         = "0.16"
 reqwest             = { version = "0.9", features = ["hyper-011"] }
-serde               = "1"
+serde               = { version = "1", features = ["derive"] }
-serde_derive        = "1"
 serde_json          = "1"
 url_serde           = "0.2"
 validator           = "0.8"

src/discovery.rs

@@ -3,7 +3,7 @@ use biscuit::Empty;
 use inth_oauth2::provider::Provider;
 use inth_oauth2::token::Expiring;
 use reqwest::{Client, Url};
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use url_serde;
 
 use crate::error::Error;

src/lib.rs

@@ -75,7 +75,7 @@ use biscuit::{Empty, SingleOrMultiple};
 use chrono::{Duration, NaiveDate, Utc};
 use inth_oauth2::token::Token as _t;
 use reqwest::Url;
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use validator::Validate;
 use validator_derive::Validate;
 

src/token.rs

@@ -3,7 +3,7 @@ use biscuit::{CompactJson, Empty, SingleOrMultiple};
 use inth_oauth2::client::response::{FromResponse, ParseError};
 use inth_oauth2::token::{self, Bearer, Expiring};
 use reqwest::Url;
-use serde_derive::{Deserialize, Serialize};
+use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use url_serde;