Update hex to 0.4

JohnTitor · JohnTitor · commit 5e177f394f3e · 2020-03-07T07:36:00.000+09:00
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -41,7 +41,7 @@ openssl = "0.10.13"
 oauth2 = "2.0.0"
 log = "0.4"
 env_logger = "0.7"
-hex = "0.3"
+hex = "0.4"
 htmlescape = "0.3.1"
 license-exprs = "^1.4"
 dotenv = "0.15"
diff --git a/src/controllers/krate/publish.rs b/src/controllers/krate/publish.rs
@@ -192,8 +192,7 @@ pub fn publish(req: &mut dyn Request) -> AppResult<Response> {
             .uploader
             .upload_crate(req, &krate, maximums, vers)?;
 
-        let mut hex_cksum = String::new();
-        cksum.write_hex(&mut hex_cksum)?;
+        let hex_cksum = cksum.encode_hex::<String>();
 
         // Register this crate in our local git repo.
         let git_crate = git::Crate {
