Add TODO about adapters and entrypoints

Signed-off-by: martin f. krafft <madduck@madduck.net>
diff --git a/TODO b/TODO
index 90e59c0..ca51150 100644
--- a/TODO
+++ b/TODO
@@ -8,3 +8,6 @@
 - Remove applications_hosts, or factor it out to the Ansible adapter, as it's
   not really relevant to Salt or reclass in general. And remove 'groups' from
   the inventory return.
+- Improve the adapters, either by just letting them build their own
+  OptionParsers, or through setuptools entrypoints (probably best…). The
+  reclass API would need a bit of generalisation for that to happen…