fix logo dimensions in readme (#249)

Author: DanielRuf

README.md

@@ -1,7 +1,7 @@
 > This project is currently in **beta and APIs are subject to change**.
 
 <div align="center">
-  <img alt="react-sketchapp" src="https://cldup.com/MxSVEkc_gb.png" height="163px" />
+  <img alt="react-sketchapp" src="https://cldup.com/MxSVEkc_gb.png" style="max-height:163px; width:100; height: auto; max-width:100%" />
 </div>
 
 <div align="center">