Update readme.md

Author: itzandroidtab

readme.md

@@ -11,6 +11,7 @@ The main screen takes the longest to draw. This is caused by the amount of pixel
 * keys never leave the token after setup
 * enter button types 6 digit key using HID keyboard (any device that supports HID keyboards should work)
 * supports up to 32 profiles
+* rechargable RTC battery
 * USB mode to add/delete profiles using a CSV file
 * support to change the RTC calibration values in the settings
 * support for setting the time
@@ -42,4 +43,4 @@ More pictures can be found [here](./img/)
 TOTP uses [klib](https://github.com/itzandroidtab/klib). This repo can be cloned in the klib project folder. See [build.yml](./.github/workflows/build.yml) for more info on compiling this project.
 
 ### Extra
-Is intended to be used with [USB dfu bootloader](https://github.com/itzandroidtab/dfu_bootloader). To build without bootloader support delete `set(TARGET_LINKERSCRIPT ...)` from the `CMakeLists.txt` in this project.
+Is intended to be used with [USB dfu bootloader](https://github.com/itzandroidtab/dfu_bootloader). To build without bootloader support delete `set(TARGET_LINKERSCRIPT ...)` from the `CMakeLists.txt` in this project.