add ubuntu to the apt installation platform

Author: CyberFlameGO

README.md

@@ -47,7 +47,7 @@ Windows | [Chocolatey](https://chocolatey.org/) | `choco install hub`
 Fedora Linux | [DNF](https://fedoraproject.org/wiki/DNF) | `sudo dnf install hub`
 Arch Linux | [pacman](https://wiki.archlinux.org/index.php/pacman) | `sudo pacman -S hub`
 FreeBSD | [pkg(8)](http://man.freebsd.org/pkg/8) | `pkg install hub`
-Debian | [apt(8)](https://manpages.debian.org/buster/apt/apt.8.en.html) | `sudo apt install hub`
+Debian, Ubuntu | [apt(8)](https://manpages.debian.org/buster/apt/apt.8.en.html) | `sudo apt install hub`
 Ubuntu | [Snap](https://snapcraft.io) | [We do not recommend installing the snap anymore.](https://github.com/github/hub/issues?q=is%3Aissue+snap)
 openSUSE | [Zypper](https://en.opensuse.org/SDB:Zypper_manual) | `sudo zypper install hub`
 Void Linux | [xbps](https://github.com/void-linux/xbps) | `sudo xbps-install -S hub`