update all packages to use actix-web v3 (#94)

actix-session/src/cookie.rs

@@ -343,7 +343,7 @@ where
     type Error = S::Error;
     type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
 
-    fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
         self.service.poll_ready(cx)
     }
 

actix-session/src/lib.rs

@@ -41,6 +41,9 @@
 //!         .await
 //! }
 //! ```
+
+#![deny(rust_2018_idioms)]
+
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::rc::Rc;