Please support newer versions of Alacritty that uses toml for configuration

I extensively use Emacs from a terminal. Your package made it possible to use older versions of Alacritty that used YAML for configuration. Recent versions have migrated to using TOML, and I am finding it difficult to override the bindings for few key combinations (e.g. Control+'). 

Please update the code to support newer versions of Alacritty. Thanks.