update url to 2.2.2 release

Author: wing328

README.md

@@ -67,18 +67,18 @@ The OpenAPI Specification has undergone 3 revisions since initial creation in 20
 Swagger Codegen Version    | Release Date | OpenAPI Spec compatibility | Notes
 -------------------------- | ------------ | -------------------------- | -----
 2.3.0 (upcoming minor release) | TBD   | 1.0, 1.1, 1.2, 2.0   | Minor release with breaking changes
-2.2.2 | 2017-03-01   | 1.0, 1.1, 1.2, 2.0   | [tag v2.2.2](https://github.com/swagger-api/swagger-codegen/tree/v2.2.2)
-2.2.1 (**current stable**) | 2016-08-07   | 1.0, 1.1, 1.2, 2.0   | [tag v2.2.1](https://github.com/swagger-api/swagger-codegen/tree/v2.2.1)
+2.2.2 (**current stable**) | 2017-03-01   | 1.0, 1.1, 1.2, 2.0   | [tag v2.2.2](https://github.com/swagger-api/swagger-codegen/tree/v2.2.2)
+2.2.1 | 2016-08-07   | 1.0, 1.1, 1.2, 2.0   | [tag v2.2.1](https://github.com/swagger-api/swagger-codegen/tree/v2.2.1)
 2.1.6 | 2016-04-06   | 1.0, 1.1, 1.2, 2.0   | [tag v2.1.6](https://github.com/swagger-api/swagger-codegen/tree/v2.1.6)
 2.0.17                     | 2014-08-22   | 1.1, 1.2             | [tag v2.0.17](https://github.com/swagger-api/swagger-codegen/tree/v2.0.17)
 1.0.4                      | 2012-04-12   | 1.0, 1.1             | [tag v1.0.4](https://github.com/swagger-api/swagger-codegen/tree/swagger-codegen_2.9.1-1.1)
 
 
 ### Prerequisites
-If you're looking for the latest stable version, you can grab it directly from maven central (you'll need java 7 runtime at a minimum):
+If you're looking for the latest stable version, you can grab it directly from Sonatype.org (Java 7 runtime at a minimum):
 
 ```
-wget http://repo1.maven.org/maven2/io/swagger/swagger-codegen-cli/2.2.1/swagger-codegen-cli-2.2.1.jar -O swagger-codegen-cli.jar
+wget https://oss.sonatype.org/content/repositories/releases/io/swagger/swagger-codegen-cli/2.2.2/swagger-codegen-cli-2.2.2.jar -O swagger-codegen-cli.jar
 
 java -jar swagger-codegen-cli.jar help
 ```