Forgot le seperator

docs/release-notes/version-2.6.md

@@ -4,6 +4,8 @@
 
 * [#3090](https://github.com/netbox-community/netbox/issues/3090) - Add filter field for device interfaces
 
+---
+
 # v2.6.11 (2020-01-03)
 
 ## Bug Fixes