Switch to using old anonymous function syntax

[beniaminogreen]

Hi there,

Thanks for writing such a fantastic package! I'm writing to ask if you would consider changing this line to use the older anonymous function syntax function(x){expression}.

The \(x) expression syntax is great, but it means that you can't install the package on machines with pre-2021 versions of R installed. Changing this line would mean that you are able to use the package on many more versions of R at the cost of tiny bit of expressiveness.

Best, and thanks for your help,
Ben

[grantmcdermott]

Thanks @beniaminogreen. I'm certainly happy to roll this PR into the main branch, but first I need to migrate the package name and repo (see #29). Hopefully this all goes smoothly and your PR is still left standing after migration...

[grantmcdermott]

Thanks!