chore: changelog for #2852

Author: vmaerten

CHANGELOG.md

@@ -5,6 +5,8 @@
 - Fixed Fish completions not being picked up correctly by installing them to
   Fish's `vendor_completions.d` directory instead of `completions` (#2850, #2859
   by @Legimity).
+- PowerShell completions now work with aliases of the `task` command, not just
+  the `task` binary itself (#2852 by @kojiishi).
 
 ## v3.51.1 - 2026-05-16