quiet installation

[johnnychen94]

So far I've seen some packages that uses the jill Python API to automate the Julia installation:

jill.py/jill/install.py

Lines 299 to 306 in 70a40d1

	def install_julia(version=None, *,
	install_dir=None,
	symlink_dir=None,
	upgrade=False,
	upstream=None,
	keep_downloads=False,
	confirm=False,
	reinstall=False):

It would be friendlier if there's a --quite, -Q keyword to silent all print command, i.e., to remove all the following output:

JILL - Julia Installer 4 Linux (MacOS, Windows and FreeBSD) -- Light

----- Download Julia -----
downloading Julia release for latest-macos-x86_64
downloading from https://mirrors.lflab.cn/julia/releases/latest/julia-latest-mac64.dmg
100% [........................................................................] 99596927 / 99596927
finished downloading julia-latest-mac64.dmg
----- Install Julia -----
remove previous Julia installation: /Applications/Julia-1.7.app
install Julia to /Applications/Julia-1.7.app
----- Post Installation -----
remove downloaded files...
remove /Users/jc/julia-latest-mac64.dmg
Done!