Add changelog entry for options deps

CHANGELOG.md

@@ -12,6 +12,15 @@ Every entry has a category for which we use the following visual abbreviations:
 
 ## Unreleased
 
+- 🎁 Feature
+  The MISP plugin now uses [extra dependencies](https://www.python.org/dev/peps/pep-0508/#extras).
+  Users can now chose the wanted dependencies during installation by running
+  `pip install threatbus-misp[zmq]` to install the ZeroMQ dependency, or
+  `pip install threatbus-misp[kafka]` to install the Kafka dependency. The
+  plugin throws a fatal error if none of these dependencies is installed and
+  exits immediately.
+  [#99](https://github.com/tenzir/threatbus/pull/99)
+
 - 🎁 Feature
   The RabbitMQ backbone plugin, the In-memory backbone plugins, and the Zmq-app
   plugin now support the