How to easily install KeePassXC on Debian 9 (Stretch)

I download Keepass XC from here:

magkopian/keepassxc-debian

And I do for example:

sudo dpkg -i keepassxc_2.3.3-1_amd64_stable_stretch.deb

Then, to install dependencies, I simply do:

sudo apt --fix-broken install

Edit

I found a much better way to do that…

Add below line to /etc/apt/sources.list :

deb http://ftp.ch.debian.org/debian sid main contrib non-free

Replace ch by letters of your country.

Then:

sudo apt update
sudo apt install -t sid keepassxc

Edit 2

Thanks to TekIT, there is an even better way:

KeepassXC is now available in Debian backports, add below line to /etc/apt/sources.list :

deb http://ftp.ch.debian.org/debian stretch-backports main non-free

Replace ch by letters of your country.

Then:

sudo apt update
sudo apt install -t stretch-backports keepassxc