add changelog entry

Author: cognifloyd

CHANGELOG.md

@@ -5,6 +5,8 @@
 * Removed reference to st2-license pullSecrets, which was missed when removing enterprise flags (#192) (by @cognifloyd)
 * Add optional imagePullSecrets to ServiceAccount using `serviceAccount.pullSecret` from values.yaml. If pods do not have imagePullSecrets (eg without `image.pullSecret` in values.yaml), k8s populates them from the ServiceAccount. (#196) (by @cognifloyd)
 * Reformat some yaml strings so that single quotes wrap strings that include double quotes (#194) (by @cognifloyd)
+* Add `st2chatops.api_key` value so that the st2chatops deployment can get the ST2_API_KEY env var instead of ST2_AUTH_USERNAME/PASSWORD. (#197) (by @cognifloyd)
+
 
 ## v0.60.0
 * Switch st2 version to `v3.5dev` as a new latest development version (#187)