Account for username in Person filter

CHANGELOG.rst

@@ -18,6 +18,7 @@ Added
 ~~~~~
 
 * OpenID Connect RSA keys can now be passed as string in config files
+* Views filtering for person names now also search the username of a linked user
 
 Fixed
 ~~~~~

aleksis/core/filters.py

@@ -54,6 +54,7 @@ class PersonFilter(FilterSet):
             "additional_name__icontains",
             "last_name__icontains",
             "short_name__icontains",
+            "user__username__icontains",
         ],
         label=_("Search by name"),
     )