Add `--allow-read` argument to CLI install instructions

[mash-graz]

Deno.execPath() as used in the more recent lume-cli scripts needs read access. Otherwise, you get a nasty warning on every invocation:

lume -h
┌ ⚠️  Deno requests read access to <exec_path>.
├ Requested by `Deno.execPath()` API.
├ Run again with --allow-read to bypass this prompt.
└ Allow? [y/n/A] (y = yes, allow; n = no, deny; A = allow all read permissions)

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[oscarotero]

Thanks!

According to the README.md in the repo, it needs --allow-env too:

deno install --allow-run --allow-env --allow-read --name lume --force --reload https://deno.land/x/lume_cli/mod.ts

Could you update the command before merging?

[mash-graz]

I didn't get a warning because of the missing --allow-env, but i'll add it.

[oscarotero]

It was required for npm packages: https://github.com/lumeland/cli/compare/v1.0.1...v1.0.2 Maybe it's not longer required?