update brew command for 2021
@@ -61,7 +61,7 @@ sudo pacman -S pandoc texlive-core
#### OSX
```bash
brew install pandoc
-brew cask install mactex
+brew install --cask mactex
```
Make sure to add the directory `/Library/TeX/texbin/` to your path or `context` and `mtxrun` will not be found.