Error on every word with only one replacement

[cfreeley]

In your index.json, many words have a string value for replace instead of an array. Each one of these words gives me an error when you call .join on the replacement here: https://github.com/admhlt/retext-usage/blob/master/index.js#L62

giving: TypeError: quotation(...).join is not a function.

Could you either rework this condition so it only calls join on an array, or wrap every replace in an array, even if it's just one?

[grugnog]

Getting this error also

[optimistiks]

Got this error as well

[kostasx]

Forked the repo and made a fix. @adamhollett let me know if I should PR.

[adamhollett]

@kostasx Feel free to PR, I'd appreciate that. To be honest I don't use retext much any more so this package hasn't had much attention.