Update to_do_list.md

Author: centydev

to_do_list.md

@@ -20,10 +20,10 @@ List of requested UI changes:
 + [x] Change Startup PPS to be Corse **#issue #17**
 + [x] Fix quickly turning the encoder makes the power supply not delivering the set voltage. **#issue #11**
 + [x] Fix Voltage selection bug near 3.3V **#issue #3**
++ [x] Add counter for mAh or Wh used **#issue #13**
 
 Backlog:
 + [ ] Add more cable loss when connect through Android adapter, detect computer connection.
-+ [ ] Add counter for mAh or Wh used **#issue #13**
 + [ ] Add reminder boot screen for buttons function **#issue #14**
 
 ```