Add new test dep

pombredanne · pombredanne · commit 35a87e5913ed · 2021-01-24T19:52:31.000+01:00
Signed-off-by: Philippe Ombredanne &lt;pombredanne@nexb.com&gt;
diff --git a/setup.cfg b/setup.cfg
@@ -53,6 +53,7 @@ full =
 
 testing =
     # upstream
+    attr
     pytest >= 6
     pytest-xdist >= 2
 
