[gnome-battery-bench] gbb monitor: print welcome message

[Christian Kellner <gicmo src gnome org>]

commit 3b7b430406475cf37fb67ff68729321d119a2402
Author: Christian Kellner <gicmo gnome org>
Date:   Wed Mar 29 18:10:23 2017 +0200

    gbb monitor: print welcome message
    
    Not only useful for humans, but also to synchronize the tests, i.e.
    as an indicator when the monitor binary is started and delivering
    notifications.

 src/commandline.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/commandline.c b/src/commandline.c
index 9483c79..6e2dc14 100644
--- a/src/commandline.c
+++ b/src/commandline.c
@@ -235,6 +235,7 @@ monitor(int argc, char **argv)
     GbbPowerMonitor *monitor;
     GMainLoop *loop;
 
+    g_print("Monitoring power events. Press Ctrl+C to cancel\n");
     monitor = gbb_power_monitor_new();
 
     g_signal_connect(monitor, "changed",