updated logos

README.md

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 CK-powered experiment crowdsourcing scenarios
 =============================================
 
-[![logo](https://github.com/ctuning/ck-guide-images/blob/master/logo-powered-by-ck.png)](http://cKnowledge.org)
-[![logo](https://github.com/ctuning/ck-guide-images/blob/master/logo-validated-by-the-community-simple.png)](http://cTuning.org)
+[![compatibility](https://github.com/ctuning/ck-guide-images/blob/master/ck-compatible.svg)](https://github.com/ctuning/ck)
 [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 
 This repository contains public scenarios (software and data sets) in the [Collective Knowledge Format](http://cKnowledge.org)