Update README.md

Author: JiaoXianjun

README.md

@@ -5,7 +5,7 @@ A BTLE (Bluetooth Low energy)/BT4.0 radio packet sender ( build based on <a href
 
 News:
 
-02 Sep. 2015: Add new packet type: discovery. Open LightBlue APP in your iPhone/device, then:
+02 Sep. 2015: Fixed-point version. Add new packet type: discovery. Open LightBlue APP in your iPhone/device, then:
 
     btle_tx packets_discovery.txt
     (packets_discovery.txt is under host/btle-tools/src)