Hydro alias needs escape character on Windows

[yu-lily]

I found that an extra escape character needs to be added to run the hydro alias on Windows (Git Bash), replacing $(pwd) with /$(pwd).

This is the alias in the readme:
docker run --rm -e LIBCCHDO_MERGER_DIVISION=CCH -e LIBCCHDO_MERGER_INITIALS=AMB -e LIBCCHDO_MERGER_INSTITUTION=SIO -v $(pwd):/context cchdo/libcchdo

This is what worked for me:
docker run --rm -e LIBCCHDO_MERGER_DIVISION=CCH -e LIBCCHDO_MERGER_INITIALS=AMB -e LIBCCHDO_MERGER_INSTITUTION=SIO -v /$(pwd):/context cchdo/libcchdo

I thought it might be helpful to document to possibly save someone else time in the future.