[feature] get several files at once

[Daniil Tsivinsky]

specify glob and download all matching files

this example will download tabs.lua and git.lua files

gget https://github.com/tsivinsky/dotfiles/blob/master/neovim/.config/nvim/lua/daniil/{tabs|git}.lua

and this one will download all files ending in .lua in daniil directory

gget https://github.com/tsivinsky/dotfiles/blob/master/neovim/.config/nvim/lua/daniil/*.lua