fish from shells:fish:release:2:2.4.0 project

For Debian 7.0 run the following:

Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).

echo 'deb http://download.opensuse.org/repositories/shells:/fish:/release:/2:2.4.0/Debian_7.0/ /' | sudo tee /etc/apt/sources.list.d/shells:fish:release:2:2.4.0.list
curl -fsSL https://download.opensuse.org/repositories/shells:fish:release:2:2.4.0/Debian_7.0/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/shells_fish_release_2_2.4.0.gpg > /dev/null
sudo apt update
sudo apt install fish