added shield

Author: joeri-vv

README.md

@@ -1,6 +1,7 @@
 <p align="center">
   <a href="https://www.bitvavo.com"><img src="https://bitvavo.com/media/images/logo/bitvavoGeneral.svg" width="600" title="Bitvavo Logo">
   <br>
+  <br>
   <a href="https://github.com/bitvavo/java-bitvavo-api.git" alt="Downloads">
   <img src="https://img.shields.io/github/downloads/bitvavo/java-bitvavo-api/total.svg" /></a>
 </p>