upgrade sha crate

Cargo.toml

@@ -53,7 +53,7 @@ rand = "0.4"
 regex = "0.2"
 serde = "1.0"
 serde_json = "1.0"
-sha1 = "0.4"
+sha1 = "0.6"
 smallvec = "0.6"
 time = "0.1"
 encoding = "0.2"

tests/test_server.rs

@@ -121,6 +121,7 @@ fn test_shutdown() {
         assert!(response.status().is_success());
     }
 
+    thread::sleep(time::Duration::from_millis(100));
     assert!(net::TcpStream::connect(addr).is_err());
 }