Added install instruction for Manjaro users on setup.sh (#606)
Added install instruction for Manjaro users on setup.sh (#606)

On manjaro the following command:
```sudo pacman -Syu pwndbg-git```
would not work.
But with yay or yoaurt it does.
cebrusfs/217gdb,anthraxx/pwndbg,anthraxx/pwndbg,anthraxx/pwndbg,cebrusfs/217gdb,pwndbg/pwndbg,pwndbg/pwndbg,anthraxx/pwndbg,cebrusfs/217gdb,cebrusfs/217gdb,pwndbg/pwndbg,pwndbg/pwndbg