add slug with occurrences

[UziTech]

add slug with occurrences to the occurrences array to prevent collisions with text ending in a number

Fixes#19

[UziTech]

right now I have it recursively check each slug with its occurrence to prevent collisions but I'm not sure if that is the best option. When a slug with an occurrence exists should it just add another occurrence or should it increment the occurrence.

varGithubSlugger=require('github-slugger')varslugger=newGithubSlugger()slugger.slug('foo-1')// returns 'foo-1'slugger.slug('foo')// returns 'foo'slugger.slug('foo')// returns 'foo-1-1'// should it return 'foo-2'?

[wooorm]

@UziTech For your question, that depends on what GH is doing! This project should match that. For an example, I’ve created a little markdown file that shows that to people in a PR here: #17

[UziTech]

it looks like github sets the second foo to foo-2

[UziTech]

I changed it so it matches github

varGithubSlugger=require('github-slugger')varslugger=newGithubSlugger()slugger.slug('foo-1')// returns 'foo-1'slugger.slug('foo')// returns 'foo'slugger.slug('foo')// returns 'foo-2'