Link andFHEM Google+ group for beta testing

Author: klassm

docs/changelog.md

@@ -6,7 +6,7 @@ bigimg: /images/changelog.jpg
 
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-Please note: There might be also a newer beta version available. To register for beta version, make sure to join the andFHEM Google+ group
+Please note: There might be also a newer beta version available. To register for beta version, make sure to join the <a href="https://plus.google.com/communities/109065806053127368354" target="_blank">andFHEM Google+ group</a>
 and register on one of the following pages below (for your installed version):
 
 <ul>