update usage

README.md

@@ -35,6 +35,7 @@ Options:
   +t,  --tty_off       force (OFF) tty mode
   -p,  --preset <id>   start with preset, integer value between 0-9
   -u,  --update <ms>   set the program update rate in milliseconds
+  -o,  --option        override a configuration option in KEY=VALUE format, can use multiple times
        --utf-force     force start even if no UTF-8 locale was detected
        --show-defaults print default configuration values to stdout
        --show-themes   list all available themes
@@ -167,4 +168,4 @@ Unless otherwise stated, the code in this repository is licensed under Apache-2.
 - [**LibreHardwareMonitor**](https://github.com/LibreHardwareMonitor/LibreHardwareMonitor), [**CppExport**](https://github.com/bjia56/LHM-CppExport), and dependencies: MPL-2.0, Apache-2.0
 - [**rocm_smi_lib**](https://github.com/ROCm/rocm_smi_lib): MIT
 
-For the most up to date list of licenses included in `cosmotop` release builds, run `cosmotop.exe --licenses`.
+For the most up to date list of licenses included in `cosmotop` release builds, run `cosmotop.exe --licenses`.