clarify readme a bit

readme.txt

@@ -1,19 +1,11 @@
-The source code has been modified per this post ie. baud rate
-changed from 9600 to 115200
+The default baud rate is 115200.
 
     https://www.wattsupmeters.com/forum/index.php?topic=8.0
 
-To compile the binary type
-
-    gcc -o wattsup wattsup.c
+To compile the binary type "make".
 
 Sample usage is as follows
 
 ./wattsup -c 1 ttyUSB0 watts
 
-This will connect to WattsUp once and output the watt usage
-
-Binary has been provided. It was compiled under Centos 5 however it should
-be usable under most modern Linux 2.6+ systems. I tested it under Ubuntu 
-8.04 and works just fine. Use at your own risk otherwise compile from 
-source.
+This will connect to WattsUp once and output the watt usage.