fixed a bug where the field name was not capitalized hence not public, also deleted unnecessary getter

internal/uptime/linux_uptime.go

@@ -37,7 +37,7 @@ func getLinuxUptime() (UptimeInformation, error) {
 	busyTime, _ = strconv.ParseFloat(fields[0], 64)
 
 	return UptimeInformation{
-		uptime: busyTime,
+		Uptime: busyTime,
 	}, nil
 }