add changelog entry

Author: cognifloyd

CHANGELOG.md

@@ -18,6 +18,7 @@
 * Make system_user configurable when using custom st2actionrunner images that do not provide stanley (#220) (by @cognifloyd)
 * Allow providing scripts in values for use in lifecycle postStart hooks of all deployments. (#206) (by @cognifloyd)
 * Add preRegisterContentCommand in an initContainer for register-content job to run last-minute content customizations (#213) (by @cognifloyd)
+* New feature: Shared packs volumes `st2.packs.volumes` -- Instead of using `st2packs` images to install packs, allow using cluster-specific persistent volumes to store packs, virtualenvs, and (optionally) configs. This enables using `st2 pack install`. (#199) (by @cognifloyd)
 
 ## v0.60.0
 * Switch st2 version to `v3.5dev` as a new latest development version (#187)