Use sha2 package instead of rust-crypto (#214)

* Use sha2 package instead of rust-crypto

* Bump rfd-notify version from 0.2.1 to 0.2.2

src/main.rs

@@ -3,7 +3,6 @@ extern crate pretty_env_logger;
 #[macro_use]
 extern crate log;
 extern crate clap;
-extern crate crypto;
 mod config;
 mod db;
 mod mail;

src/rfd.rs

@@ -1,10 +1,9 @@
 use crate::config::Config;
 use crate::db;
 use crate::mail;
-use crypto::digest::Digest;
-use crypto::sha2::Sha256;
 use regex::RegexBuilder;
 use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
 
 #[derive(Serialize, Deserialize)]
 pub struct Deals {
@@ -69,8 +68,9 @@ pub fn parse_posts(response: String) -> Posts {
 fn hash_deal(topic: &Topic) -> String {
     let digest = format!("{}{}{}", topic.web_path, topic.title, topic.post_time);
     let mut hasher = Sha256::new();
-    hasher.input_str(&digest);
-    hasher.result_str()
+    hasher.update(digest);
+    let result: String = format!("{:X}", hasher.finalize());
+    result
 }
 
 pub fn match_deals(deals: Deals, config: Config, dbpath: &str) {