[CHANGELOG] add v0.25.0 version (service account support)

Author: Vince-Chenal

CHANGELOG.md

@@ -5,6 +5,9 @@
 * Fix st2web ingress which should have been defined as an Integer instead of a String (#111) (by @erenatas)
 * Add an option to inject hostAliases in the st2actionrunner containers (#114)
 
+## v0.25.0
+* Add support for Service Accounts (by @Vince-Chenal)
+
 ## v0.24.0
 * Fix st2web ingress to use `/` path by default instead of `/*`, useful for nginx ingress controller (#103) (by @erenatas)
 * Add ability of templating on `st2.keyvalue` in Helm Values (#108) (by @erenatas)