Suggested to update README - how to install with Homebrew

[ybeapps]

Hi @love-linger

first thing, I would like to say thanks
the recent changes are quite amazing!! (colors, ENV fix, reflog support and more)!!!

second thing,
I know it was too much for you and you didn't want to waste time on it..
but I did it - for my own usage...
now every Mac user can easily install sourcegit via homebrew
it only requires to run the following commands:

brew tap ybeapps/homebrew-sourcegit
brew install --cask --no-quarantine sourcegit

it's maintained in this repo: https://github.com/ybeapps/homebrew-sourcegit

twice a day, it fetches the latest version from official sourcegit repo and compare with the version in Homebrew.. if newer version found, it automatically updates the references =]

I'm suggesting:

1. updating readme to notify users about this support - you can specify this is third-party if you like
2. OPTIONAL: if you want we can try to setup auto action trigger upon release publish... if you can trigger the action in my repo I can remove the schedule =]
3. OPTIONAL FUTURE: if you like you can just take it to your repo, and I can archive my repo =]

thanks again for all!!

[love-linger]

Thank you VERY VERY MUCH for your support of this project!!!

I'll update the README.md to let users notice this.