Updating ordered task list items with leading space fails

[mtodd]

It seems prepending an ordered task list item with a space will prevent updates from occurring.

 1. [ ] can't update this because of the leading space

Unordered lists are not affected by this issue.

I'm fairly certain it's a discrepancy with how we handle spacing for the ordered list item pattern here:
https://github.com/github/task-lists/blob/242b5241238f5f59040005cda53e54b6debbc627/app/assets/javascripts/task_lists.coffee#L109

//cc @github/task-lists @nuclearsandwich @rsese

[mtodd]

1. test

[mtodd]

This is fixed as a result of changes in #36 moving the whitespace pattern to a more general spot in the prefix match portion. Closing since this will be rolled in the next release (being cut soon).