Suggestion from @schneems in the code review of #47. When a package can't be found in the index we could easily provide a list of similar names to save the user from having to look these up themselves.

[Optional suggestion/enhancement] - If we have the index with package names and we think it's mis-spelled we could use levenshtein distance to list what possible alternatives might be https://github.com/schneems/going_the_distance.

I do something like that in which_problem https://github.com/schneems/which_problem/blob/65bda424cf62bc04aa23f192e971a80e4db0ae83/which_problem/src/suggest.rs#L37-L40