fix README

README.md

@@ -10,7 +10,7 @@ The **OpenQuake Engine** is an open source application that allows users to comp
 -| [![Build Status](https://ci.openquake.org/job/master_oq-engine/badge/icon)](https://ci.openquake.org/job/master_oq-engine/) | [![Build Status](https://travis-ci.org/gem/oq-engine.svg?branch=master)](https://travis-ci.org/gem/oq-engine) |
  
 -### Current stable
-+## OpenQuake Engine version 2.7 (Housner)
++## OpenQuake Engine version 2.6 (Gutenberg)
  
 -Current stable version is the **OpenQuake Engine 2.5** 'Fourier'. The documentation is available at https://github.com/gem/oq-engine/tree/engine-2.5#openquake-engine.
 -* [What's new](https://github.com/gem/oq-engine/blob/engine-2.5/doc/whats-new.md)
@@ -31,8 +31,8 @@ The **OpenQuake Engine** is an open source application that allows users to comp
 
 ### Current stable
 
-Current stable version is the **OpenQuake Engine 2.6** 'Gutenberg'. The documentation is available at https://github.com/gem/oq-engine/tree/engine-2.6#openquake-engine.
-* [What's new](https://github.com/gem/oq-engine/blob/engine-2.6/doc/whats-new.md)
+Current stable version is the **OpenQuake Engine 2.7** 'Housner'. The documentation is available at https://github.com/gem/oq-engine/tree/engine-2.7#openquake-engine.
+* [What's new](https://github.com/gem/oq-engine/blob/engine-2.7/doc/whats-new.md)
 
 ## Documentation (master tree)