Prepare for 1.22 release

Author: steveklabnik

_config.yml

@@ -1,18 +1,18 @@
 name: The Rust Programming Language
-stable: "1.21.0"
-stable_date: "2017-10-12"
-stable_blog: "https://blog.rust-lang.org/2017/10/12/Rust-1.21.html"
-stable_full_version: "rustc 1.21.0 (3b72af97e 2017-10-09)"
-beta: "1.22"
-beta_date: "2017-11-23"
-nightly: "1.23"
+stable: "1.22.0"
+stable_date: "2017-11-22"
+stable_blog: "https://blog.rust-lang.org/2017/11/22/Rust-1.22.html"
+stable_full_version: "rustc 1.22.0 (9c21f8ff4 2017-11-20)"
+beta: "1.23"
+beta_date: "2017-11-21"
+nightly: "1.24"
 channels:
   - name: "stable"
-    vers: "1.21.0"
-    package: "1.21.0"
+    vers: "1.22.0"
+    package: "1.22.0"
   - name: "beta"
-    vers: "1.22"
+    vers: "1.23"
     package: "beta"
   - name: "nightly"
-    vers: "1.23"
+    vers: "1.24"
     package: "nightly"