zsh: enable completion support for chg as well
When verifying this change, you may need to clear/rebuild the completion cache;
I did this by deleting the ~/.zcompdump file and then starting a new shell.
Differential Revision: https://phab.mercurial-scm.org/D6574
@echo off
powershell -NoProfile -ExecutionPolicy unrestricted -Command "& '%~dp0\editmergeps.ps1' %*"