update latest version in README

Author: frantuma

README.md

@@ -33,7 +33,8 @@ The OpenAPI Specification has undergone several revisions since initial creation
 
 Swagger core Version      | Release Date | OpenAPI Spec compatibility | Notes | Status
 ------------------------- | ------------ | -------------------------- | ----- | ----
-2.0.5 (**current stable**)| 2018-09-19   | 3.0           | [tag v2.0.5](https://github.com/swagger-api/swagger-core/tree/v2.0.5) | Supported
+2.0.6 (**current stable**)| 2018-11-27   | 3.0           | [tag v2.0.6](https://github.com/swagger-api/swagger-core/tree/v2.0.6) | Supported
+2.0.5                     | 2018-09-19   | 3.0           | [tag v2.0.5](https://github.com/swagger-api/swagger-core/tree/v2.0.5) | Supported
 2.0.4                     | 2018-09-05   | 3.0           | [tag v2.0.4](https://github.com/swagger-api/swagger-core/tree/v2.0.4) | Supported
 2.0.3                     | 2018-08-09   | 3.0           | [tag v2.0.3](https://github.com/swagger-api/swagger-core/tree/v2.0.3) | Supported
 1.5.21 (**current stable**)| 2018-08-09  | 2.0           | [tag v1.5.21](https://github.com/swagger-api/swagger-core/tree/v1.5.21) | Supported