doc(readme): update packaging info
- Loads settings from Xresources. See https://git.io/vVisW
- Live-reloads settings from xrdb on USR1 signal (like termite)
-- Is available as an AUR package `xst-git` (binary and man also still named st)
-- Is available as a copr package for Fedora`keefle/xst` (binary and man also still named st)
- Has cursor blinking options
- Has the following [st-patches](http://st.suckless.org/patches/) applied:
- spoiler
- boldcolors (only the ability to disable bold fonts)
- vertcenter
- alpha (transparent background)
+- Available packages:
+ - Arch Linux (AUR): `xst-git`
+ - Fedora (COPR): `keefle/xst`
Thanks to:
