Add cask for EQMac

From http://eqmac.hulse.id.au/
I’ll ask you to add two lines of comments above this line (similar to [`imagemin`](https://github.com/caskroom/homebrew-cask/blob/c0ec50227ea2c9053e532a1a2879b8fe0362e53d/Casks/imagemin.rb))

```
# Renamed for clarity: app name is inconsistent with the branding on the website, and will be corrected in the next version.
# Original discussion: https://github.com/caskroom/homebrew-cask/pull/8438
```