added restUrl and wsUrl, updated logo

Author: joeri-vv

README.md

@@ -1,6 +1,6 @@
 <p align="center">
   <br>
-  <a href="https://bitvavo.com"><img src="https://bitvavo.com/assets/static/ext/logo-shape.svg" width="100" title="Bitvavo Logo">
+  <a href="https://bitvavo.com"><img src="https://bitvavo.com/assets/static/ext/logo-shape.svg" width="100" title="Bitvavo Logo"></a>
 </p>
 
 # PHP Bitvavo API