crofty 0.11.0 — apt & dnf on Linux, and an update notice

On Linux, installing and updating crofty was manual, and it was easy to miss a newer release.

Before

After

# Debian/Ubuntu
echo "deb [trusted=yes] https://apt.fury.io/shirodoromoto/ * *" | sudo tee /etc/apt/sources.list.d/crofty.list
sudo apt update && sudo apt install crofty
# Fedora/RHEL
sudo tee /etc/yum.repos.d/crofty.repo >/dev/null <<'EOF'
[crofty]
name=crofty
baseurl=https://yum.fury.io/shirodoromoto/
enabled=1
gpgcheck=0
EOF
sudo dnf install crofty