Prepare for 2.2.1 release

Author: johnnyreilly

.travis.yml

@@ -18,4 +18,4 @@ env:
   - [email protected]
   - [email protected]
   - [email protected]
-#  - TYPESCRIPT=typescript@next
+  - TYPESCRIPT=typescript@next

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## v2.2.1 - NOT RELEASED YET
+## v2.2.1
 
 - [Report errors in JS(X) files when CheckJS is enabled](https://github.com/TypeStrong/ts-loader/pull/564) - thanks @schmuli!
 - [Cater for change to @types acquisition strategy in TypeScript 2.4.1](https://github.com/TypeStrong/ts-loader/pull/566) - thanks @johnnyreilly

appveyor.yml

@@ -9,7 +9,7 @@ environment:
   - TYPESCRIPT: [email protected]
   - TYPESCRIPT: [email protected]
   - TYPESCRIPT: [email protected]
-#  - TYPESCRIPT: typescript@next
+  - TYPESCRIPT: typescript@next
 install:
   - ps: Install-Product node $env:nodejs_version
   - npm install