Updated readme to point to SFML 2.6.1

readme.md

@@ -9,7 +9,7 @@ SFML is a simple, fast, cross-platform and object-oriented multimedia API. It pr
 Development is focused on the next major version in the `master` branch. No more features are planned for the 2.x release series.
 
 -   The [`master`](https://github.com/SFML/SFML/tree/master) branch contains work in progress for the next major version SFML 3. As such it's considered unstable, but any testing and feedback is highly appreciated.
--   The [`2.6.0`](https://github.com/SFML/SFML/tree/2.6.0) tag is the latest official SFML release and will be the last minor release in the 2.x series.
+-   The [`2.6.1`](https://github.com/SFML/SFML/tree/2.6.1) tag is the latest official SFML release and will be the last minor release in the 2.x series.
 
 ## CMake Template