Some parenthesis removal

Thank you for having shared this massive list of design patterns. It is a reference :book:.

If you allow me, I've removed unnecessary parenthesis like:
```
func = () -> callThis()
# Into
func = -> callThis()
```

CoffeeScript is so clean :sunglasses:. Doing these patterns in JS would have been an horrific job :sweat:. You rock! :clap: 
I would prefer to leave the parens here