docs(readme): recommend installing as lsblk.lua

On FreeBSD, the path `/usr/local/bin/lsblk`
means vermaden's script because of the port sysutils/lsblk.
Let's not get lsblk.lua confused with it
and avoid a filename conflict by default.

Author: dbohdan

README.md

@@ -20,12 +20,11 @@ cd lsblk.lua
 # Install for the current user.
 # You may need to add `~/.local/bin/` to `PATH`.
 mkdir -p ~/.local/bin/
-install lsblk.lua ~/.local/bin/lsblk
+install lsblk.lua ~/.local/bin/
 
 # Install for all users.
 # Replace `sudo` with `doas` or `su -c` as necessary.
-# Change `lsblk` to `lsblk-lua` or `lsblk.lua` to avoid conflict with sysutils/lsblk.
-sudo install lsblk.lua /usr/local/bin/lsblk
+sudo install lsblk.lua /usr/local/bin/
 ```
 
 ## Usage