Update README.md: some information about Arch

[alerezaaa]

Hi

I installed miniconda3 from AUR and I couldn't install conda-bash-completion using provided command in Normal user (I dont know why)

I tried installing it by root user and it was successful, so I decided to add this part which maybe helpful

Thanks

[tartansandal]

Hi @alerezaaa. Thanks for the PR. 😄

The root cause of the problem is the AUR miniconda package installing into a directory that a normal user does not have write permissions, but without documenting how that normal user is then expected to use the conda command.

This problem is going to occur for any conda package installed with this AUR miniconda. Looking at the comments under https://aur.archlinux.org/packages/miniconda3, I see the same problem with installing jupyterlab.

Running the conda commands as root does work, but it's not ideal for the security of your system.

A better solution is documented here. The special group should really be created by the AUR package and instructions for its use documented by the package maintainer. There is probably another solution involving environment variables, but it's up to the AUR package maintainer(s) to solve all the related problems and document how it is supposed to work.

I'm closing this PR for now, because I don't think it is the right place to document getting conda-bash-completion to work in this situation. Please feel free to comment or reopen if you think I've got this wrong. ☝️

Thanks again.