add changelog entry

CHANGELOG.md

@@ -7,6 +7,7 @@
 * Reformat some yaml strings so that single quotes wrap strings that include double quotes (#194) (by @cognifloyd)
 * st2chatops change: If `st2chatops.env.ST2_API_KEY` is defined, do not set `ST2_AUTH_USERNAME` or `ST2_AUTH_PASSWORD` env vars any more. (#197) (by @cognifloyd)
 * Add image.tag overrides for all deployments. (#200) (by @cognifloyd)
+* Add advanced pod placment (nodeSelector, affinity, tolerations) to specs for batch Jobs pods. Also move the advanced pod placement into a helper to reduce duplication. (#193) (by @cognifloyd)
 
 ## v0.60.0
 * Switch st2 version to `v3.5dev` as a new latest development version (#187)