message: Latest version of systemd file.
diff: Description=Casper Node
  Documentation=https://docs.casperlabs.io
  ConditionPathExists=/etc/casper/config.toml
  +ConditionPathExists=/etc/casper/accounts.csv
  +ConditionPathExists=/etc/casper/chainspec.toml
  After=network-online.target
  [Service]
  Type=simple
  ExecStart=/usr/bin/casper-node validator /etc/casper/config.toml
  Environment=RUST_LOG=info
  +StandardOutput=file:/var/log/casper-node.log
  +Restart=no
  [Install]
  WantedBy=multi-user.target
  