update docs to reflect font issue

Author: justinhj

README.md

@@ -26,6 +26,10 @@ The plugin is written in Lua and depends heavily on the Plenary library for its
 - [nvim-lua/plenary.nvim](https://github.com/nvim-lua/plenary.nvim)
 - [nvim-tree/nvim-web-devicons](https://github.com/nvim-tree/nvim-web-devicons)
 
+*NOTICE* Please check the nvim-web-devicons repo for information on breaking changes to Nerd Fonts. This dependency is used to show the icons in this plugin and requires a compatible font. Thank you to Github user @david-0609 for bringing this to my attention and updating the icons used in this application. Should you encounter missing icons please upgrade the font you are using so it is using 2.3 or 3.0.
+
+_If you do not wish to upgrade your font you can pin to a previous version of the plugin using tag v0.8.0 instead of the main branch._
+
 ### OS dependencies
 On Windows and macOS, PowerShell and pmset are used to obtain battery status respectively.
 For Linux `acpi` is used, and may not be installed by default on your distribution. See [How to handle acpi events on Linux](https://linuxconfig.org/how-to-handle-acpi-events-on-linux). The package must be correctly installed and in your executable path.