Revert back to actix 0.10

Until Actix Web 4, we need to use an older version of actix so that the
runtime's match up to version 1.

src/main.rs

@@ -11,7 +11,7 @@ use std::sync::mpsc::channel;
 use std::sync::Arc;
 use std::{env, fs::File};
 
-use actix::{Actor, Addr};
+use actix::prelude::*;
 use actix_files::NamedFile;
 use actix_multipart as mp;
 use actix_web::{
@@ -401,7 +401,7 @@ fn main() -> std::io::Result<()> {
         }
     });
 
-    let system = actix::System::new();
+    let system = actix::System::new("image-api");
     let act = StreamActor {}.start();
 
     let app_data = web::Data::new(AppState {