Change Shaarli revision to HEAD (#564)

Shaarli master is not up to date right now.
https://github.com/YunoHost-Apps/shaarli_ynh/issues/32

(We already have a master + testing branch)

community.json

@@ -1186,7 +1186,7 @@
     "shaarli": {
         "branch": "master",
         "level": 5,
-        "revision": "bfa6d03f682a4902aae3e66caa73f1da4b05f5c2",
+        "revision": "HEAD",
         "state": "working",
         "url": "https://github.com/YunoHost-Apps/shaarli_ynh"
     },