add revision history

README.md

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+#uBITX
+uBITX firmware, written for the Raduino/Arduino control of uBITX transceivers
+This project is based on https://github.com/afarhan/ubitx and all copyright is inherited.
+The copyright information of the original is below.
 
+KD8CEC
+----------------------------------------------------------------------------
+## REVISION RECORD
+0.25
+  - Beta Version Released
+    http://www.hamskey.com/2018/01/release-beta-version-of-cat-support.html
+  - Added CAT Protocol for uBITX
+  - Modified the default usb carrier value used when the setting is wrong.
+  - Fixed a routine to repair when the CAT protocol was interrupted.
+
+0.24
+  - Program optimization
+    reduce usage ram rate (string with M() optins)
+  - Optimized CAT protocol for wsjt-x, fldigi
+
+0.23
+  - added delay_background() , replace almost delay() to delay_background for prevent timeout
+  - cat library compatible with FT-817 Command 
+    switch VFOA / VFOB, 
+    Read Write CW Speed
+    Read Write CW Delay Time
+    Read Write CW Pitch (with sidetone)
+    All of these can be controlled by Hamradio deluxe.
+
+  - modified cat libray function for protocol for CAT communication is not broken in CW or TX mode
+  - Ability to change CW Delay
+  - Added Dial Lock function
+  - Add functions CW Start dely (TX -> CW interval)
+  - Automatic storage of VFO frequency
+    It was implemented by storing it only once when the frequency stays 10 seconds or more after the change.
+    (protect eeprom life)
+
+  
+0.22
+  - fixed screen Update Problem
+  - Frequency Display Problem - Problems occur below 1Mhz
+  - added function Enhanced CAT communication
+  - replace ubitx_cat.ino to cat_libs.ino
+  - Save mode when switching to VFOA / VFOB
+
+
+0.21
+  - fixed the cw side tone configuration.
+  - Fix the error that the frequency is over.
+  - fixed frequency display (alignment, point) 
+
+
+0.20 
+  - original uBITX software (Ashhar Farhan)
+
+## Original README.md
 uBITX firmware, written for the Raduino/Arduino control of uBITX transceigers
 
 Copyright (C) 2017,  Ashhar Farhan