=== systemd service notification for Nim

Client for the systemd "sd_notify" protocol. Sends message to systemd to notify service startup, ping the watchdog and other events.

Installation:
[source,bash]
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nimble install sdnotify
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Usage:
[source,nim]
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import sdnotify

let sd = newSDNotify()

# Notify the application is ready
sd.notify_ready()

# Set status
sd.send_msg("STATUS=Running as expected")

# Notify of an error
sd.notify_errno(2)

# Notify of a D-Bus error
sd.notify_buserror("org.freedesktop.DBus.Error.TimedOut")

# Set main process PID
sd.notify_main_pid(1234)

# Ping the watchdog
sd.ping_watchdog()

# Set the watchdog timer to 1s
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Example systemd service file:
[source,ini]
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[Unit]
Description=My service

[Service]
ExecStart=/tmp/myservice
Restart=always
Type=notify
WatchdogSec=10s

[Install]
WantedBy=multi-user.target
----