bump minimum supported rustc version because of minor version change of parking_lot crate

.appveyor.yml

@@ -4,13 +4,13 @@ environment:
   matrix:
     # Stable channel
     - TARGET: i686-pc-windows-gnu
-      CHANNEL: 1.21.0
+      CHANNEL: 1.24.0
     - TARGET: i686-pc-windows-msvc
-      CHANNEL: 1.21.0
+      CHANNEL: 1.24.0
     - TARGET: x86_64-pc-windows-gnu
-      CHANNEL: 1.21.0
+      CHANNEL: 1.24.0
     - TARGET: x86_64-pc-windows-msvc
-      CHANNEL: 1.21.0
+      CHANNEL: 1.24.0
     # Stable channel
     - TARGET: i686-pc-windows-gnu
       CHANNEL: stable

.travis.yml

@@ -8,11 +8,11 @@ cache:
 
 matrix:
   include:
+    - rust: 1.24.0
     - rust: stable
     - rust: beta
     - rust: nightly
   allow_failures:
-    - rust: 1.21.0
     - rust: nightly
 
 env:

README.md

@@ -27,7 +27,7 @@ Actix web is a simple, pragmatic and extremely fast web framework for Rust.
 * [API Documentation (Releases)](https://docs.rs/actix-web/)
 * [Chat on gitter](https://gitter.im/actix/actix)
 * Cargo package: [actix-web](https://crates.io/crates/actix-web)
-* Minimum supported Rust version: 1.22 or later
+* Minimum supported Rust version: 1.24 or later
 
 ## Example
 

src/lib.rs

@@ -59,7 +59,7 @@
 //! * SSL support with OpenSSL or `native-tls`
 //! * Middlewares (`Logger`, `Session`, `CORS`, `CSRF`, `DefaultHeaders`)
 //! * Built on top of [Actix actor framework](https://github.com/actix/actix)
-//! * Supported Rust version: 1.22 or later
+//! * Supported Rust version: 1.24 or later
 
 #![cfg_attr(actix_nightly, feature(
     specialization, // for impl ErrorResponse for std::error::Error